bing tracking image
  1. Gooseneck and Fifth Wheel Adapters
  2. Reese
  3. Fifth Wheel Trailer to Gooseneck Hitch
  4. Replaces King Pin
  5. 20000 lbs GTW
  6. King Pin Adapters
Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs

Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs

Item # RP85FR
Retail:$3,060.73
Our Price: $2,152.20
You Save: $908.53
Gooseneck and Fifth Wheel Adapters
This item qualifies for Free Truck Freight Shipping
Shipping Weight: 220 lbs
Quantity: 
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
Tow your fifth-wheel trailer with your gooseneck hitch and get the smooth, stable ride that only an air-ride-equipped coupler can deliver. This trailer coupler adapter has a built-in air bag that provides cushion and absorbs road shock. 1-800-496-5010 to order Reese gooseneck and fifth wheel adapters part number RP85FR or order online at etrailer.com. Free expert support on all Reese products. Great prices and Fastest Shipping for Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs. Gooseneck and Fifth Wheel Adapters reviews from real customers.
  • All Info
  • Reviews (251)
  • Q & A (0)
  • Photos
  • Why etrailer?

Reese Gooseneck and Fifth Wheel Adapters - RP85FR

  • Fifth Wheel Trailer to Gooseneck Hitch
  • Replaces King Pin
  • 20000 lbs GTW
  • Reese
  • King Pin Adapters
  • Adapts Trailer

Tow your fifth-wheel trailer with your gooseneck hitch and get the smooth, stable ride that only an air-ride-equipped coupler can deliver. This trailer coupler adapter has a built-in air bag that provides cushion and absorbs road shock.


Features:

  • Air ride coupler lets you tow your 5th-wheel trailer with your gooseneck hitch
    • Goose Box replaces standard pin box on 5th-wheel trailer
    • Endorsed by Lippert Components Inc. - will not affect the warranty on their trailer frames
  • Fully enclosed air bag and dual shock absorbers provide cushion and absorb road shock
    • Improves handling and overall ride
    • Decreases both vertical shock (bounce) and longitudinal shock (chucking)
    • Limits strain on truck and trailer frames
  • Sturdy steel is powder coated for corrosion resistance
  • Pivot tube helps to minimize jarring by allowing fore and aft movement
  • Simple, bolt-on installation
    • Mounting hardware included


Specs:

  • Designed to replace Lippert 1621, 1716, 0719, Rhino, and Fabex PB 600 series pin boxes
  • Towing capacity: 20,000 lbs
  • Tongue weight capacity: 5,000 lbs
  • Ball size: 2-5/16"
  • Limited lifetime warranty


Note: If you are replacing a Lippert 1716 pin box, you will need to purchase the Reese spacer kit (RP97FR - sold separately) to install this coupler.



Fifth-Wheel-to-Gooseneck Adapter

This unique coupler lets you tow your fifth-wheel trailer with your gooseneck hitch. It is air ride equipped to ensure that less stress is put on your trailer's frame than is typical with traditional king pin adapters. Simply replace your trailer's existing pin box with the Goose Box and you'll be ready to go.


Eliminate Chucking and Jarring

The Goose Box is designed to absorb road shock for a smooth, stable ride. The internal air bag can be adjusted to give you just the right amount of support, so you will lose the bounce but avoid the stiff, rigid ride that occurs when towing with an overinflated air bag. Also included in the Goose Box are dual shock absorbers, which extend the life of the air bag by ensuring that compression occurs in a controlled fashion.


Cutaway Diagram of Reese Products Goose Box
  1. The air bag can be adjusted to provide a smooth ride for both your truck and trailer. Because it is fully enclosed, it's protected from UV exposure and shielded from road hazards.
  2. Dual shock absorbers help to reduce bounce and relieve stress on your trailer frame.
  3. The integrated pivot tube allows the Goose Box to move fore and aft, minimizing chucking.
  4. The gooseneck coupler attaches to the 2-5/16 inch ball on your gooseneck trailer hitch.



94920 Reese Products GooseBox - Fifth Wheel Trailer to Gooseneck Trailer Hitch Coupler - Third Generation

Replaces Reese 94720

Installation Details RP85FR Installation instructions




Customer Reviews

Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs - RP85FR

Average Customer Rating:  4.7 out of 5 stars   (251 Customer Reviews)

Tow your fifth-wheel trailer with your gooseneck hitch and get the smooth, stable ride that only an air-ride-equipped coupler can deliver. This trailer coupler adapter has a built-in air bag that provides cushion and absorbs road shock.

by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


Very heavy duty, probably should have got the 16k. Installed on 43’ 2022 Salem Hemisphere 356QB at the dealership. Never moved the trailer with 5th wheel hitch so not sure how that would have compared. The guys at the RV dealership were really impressed with this hitch and now recommend this to anyone wanting to switch to goose neck hitch. Air ride is AMAZING! absorbs every bump without transferring to toe vehicle. You can see the trailer and hitch moving but don’t feel it. Extremely happy I purchased this rather than the 5th wheel setup for factory towing prep. I think this is well worth the couple hundred extra and not have to deal with that in the bed.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


This Goosebox is heavy but I was able to get it installed by myself with help from my wife while tightening the bolt. When UPS freight delivered this, the driver was kind enough to load it directly into my truck so I did not have to lift it up. Using my truck I was able to back it into position where it went in effortlessly. I first took the zirk fitting out so I did not break it. The Goosebox was shored up using 2X4 pieces and then strapped in place, so it was in position while backing it up to the fifth wheel. This is a well made and stout pinbox replacement. The one issue I do have is that the air inflation gauge is very hard to see. Basically it is a black bar inside a black hole. The next time I am hooked up, I intend to put some white or other bright colored paint on the bar for easier viewing. No more lifting the heavy hitch to of the bed to use the truck. As always etrailer is hard to beat, fast shipping, expert advice, great prices.


Comments
After a year now, I can say this was a great move for me. It functions flawlessly with no chucking or clanking of any kind. Just be sure not to over inflate.
Donald - 08/13/2022


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


Overall a great upgrade, but not perfect.
Happy to have gone this way from the previous 5th wheel hitch setup.

Pros:
* Having nothing in the bed of the truck, except when towing.
* There is more room for a larger bed chest without the 5th wheel hitch (replaced a B&W Companion slider).
* Air bag system seems less jarring on the frame of the 5th wheel than the B& W Companion / Lippert Rotaflex.
* Seems to have reduced further what little "chucking" there was with the Companion/Rota-Flex setup.

Cons:
* Lining up to hitch is a PITA. Reese should really rethink this.
* Towing is not as confidence inspiring. The trailer feels like it wallows in rough undulating turns in comparison to the 5th wheel connection.
* Sits much lower than the 5th wheel pin box, so at level RV sites the bottom of the hitch is lower than the truck bed. That affects the length of RV site needed as the truck can't back under the trailer to park.
* The pinbox structure requires more room in the bed, limiting what can be placed on the sides & rear of the bed.

To help with hitching, I'm going to make a magnetic "sighting" system that can be seen through the rear window. something that can be tossed in the bed chest when not in use. Currently I'm using the bed camera (in the CHMSL) along with a camera that I set on the wheel well, and that is marginal at best. It still takes multiple attempts because of the limited tolerance. Once the bed chest is installed the camera will be pretty ineffective.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


I like the Goosebox was easy to install. Took me and wife about 2 hours but I am in my mid 70’s. I used my tractor and loader which took a lot of work out of it.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


My camper is 4 yrs old. I was using a gooseneck offset adapter to hitch fifth wheel to truck B&W gooseneck hitch. I upgraded to the Reese 16k Goosebox with a recommendation from a friend. I am absolutely impressed by how this hitch tows. No more chucking, the airbag and shocks add a much needed level of comfort. My camper is a Starcrart AR-One Maxx 26BHS. I’m towing with a 2005 Ram 3500 4x4 CCSB. I am using the B&W offset hitch ball to create more space between the truck cab and camper bulkhead. Highly recommend this hitch to anyone looking to tow their 5’er with a gooseneck ball hitch.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


1. It has developed a noisy sqeeking sound that I have not been able to find. I have used the grease fitting, but didn't seem to help.
2. The air level indicator could be a bright color for a better visual.
3. The pull cable was a little short, had to extend it.
4. The ride is a little more bouncier than a 5th wheel hitch.
Overall- not having the bulky 5th wheel hitch in the bed of the truck is nice




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


I have completed the installation of the Reese Gooseneck pin Box 20K on my 2019 Columbus 1492 366RL. The installation went well for 2 people. The installation was done as suggested in the instructions, one step below the original fifth wheel hitch.
That actually proved to be too high for my 2019 GMC DenaliHD 4x4 DRW so I moved the hitch to the same position as the original equipment and the height works much better. I was able to unbolt and reset the position of the hitch by myself using the truck bed as a "work bench" and raising and lowering the RV to align the holes. Haven't towed it yet but will soon and provide more info. As you can tell by the photos, the safety chain installation was very easy.


Comments
The Reese Gooseneck is awesome. Smoother pull and less bouncing. I recommend anyone with a fifth wheel to convert to a reese gooseneck.
John G - 04/04/2020


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


I installed the reese 20k goosebox yesterday by myself except for a small amount of help from my wife. Install was easy. Haven't had time to try it out yet.


Comments
I love the reese goosebox. It may be a little harder to hook up with, but there are ways to help with that 1 is utube. It makes for a much nicer and smother ride compared to the 5th wheel hitch.
Royce - 08/28/2022


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


It's a great hitch. Works perfectly, and I'm able to have my truck bed. Highly recommended.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


Very simple ordering process, great communication all the way to the carrier.
Product arrived well packaged and strapped to a pallet.
Installation was straight forward and only took an hour including removal of the old gooseneck.
Looking forward to using this in the next week.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


The Reese Goose box is a great addition to our fifth wheel. It torsion flexibility and its air bag give great control over the ride. We replaced the standard Lippert fifth wheel hitch with this and the ride difference over the rigid Lippert hitch is amazing. It was easy to install and is very easy to connect and disconnect to the tow vehicle. We're very glad we made this decision and recommend it strongly.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


I think the Goose Box is a great product. However, I searched on the eTrailer site and found that someone with the same make/model of RV and was guided to a particular Goose Box. I contacted etrailer, provided them with the year, make and model of RV - and asked to confirm if this was the same pinbox and if this particular model of Goose Box was correct and would fit my RV. trailer confirmed, so I placed the order. Unfortunately, in my model year, the pinbox changed and the Goose Box did not fit. etrailer did offer to return the product if I paid approximately $XXX in shipping. Coupled with etrailer sending me the wrong chains - I will look elsewhere for all my future RV needs.


Comments
Pin boxes can be different on an RV even if they made by the same manufacturer. The easiest way to determine which pin box you have is by looking on the pin box. There should be a sticker that gives the pin box manufacturers name and the model number. If you cannot find the sticker or it is not legible, another way to find the pin box information is to contact the trailer manufacturer directly. They can determine which OEM pin box was installed on your trailer using the trailers serial number. The final way to determine which pin box you have is by taking a few measurements. I have attached an FAQ article on measuring your pin box as well as a photo showing the measurements you will want to take. Based on the various measurements, we can determine which pin box you have and which replacement air ride pin box will work for you.
-- Etrailer Expert Jenny N - 08/03/2022


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


This really was a game changer from my conventional hitch set up. No more lifting a heavy hitch receiver out of my truck bed when not in use, and the hitching process is a breeze. No binding or hitch slide issues. The ride was much smoother with the air system. I installed it myself with the help of one other person and didn't have any problems. Have about 6k miles on it now and it's awesome. Worth the money.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


This thing is great! Install was a breeze took about 2 hours to install taking my time and torque. All I did was sat the pin box up on cardboard and wooden blocks, then slid the pin box under the king pin when it was close enough. A buddy and I installed it.

Towing is very smooth and nice and easy. No bucking.

Everything is great with this gooseneck pin box. I'm extremely happy and I'm even at the camp site right now reviewing this! Thanks etrailer.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


IF you have a gooseneck ball and a fifth wheel RV, then this is the perfect match for your rig! The Reese Goosebox changes everything! Easier hook up and unhooking. Smooth ride and easy installation. etrailer has plenty of videos for review and installation, plus you can call them and ask about it if you have any questions. I have had it for a year now and just installed it on its second camper and I would have it any other way! It is exactly what you need!


Comments
Love it!
Jesse H - 05/20/2021


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


One of the best purchases I have ever made when it comes to towing a fifth wheel.


Comments
One year later and still very glad I made the switch. I have had to re-inflate the air bag a few times, but I have no regrets whatsoever about this purchase.
Jeremy - 08/12/2022


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


It works very well. The whiplash is gone. I would have given it 6 stars except for the fact that it leaks a little air. I have to fill it every month or so. I have a friend with the same hitch and the same problem. I haven't found the leak yet in spite of spraying soapy water etc. etc.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


After being a little hesitant on the purchasing of this item, I did research and pulled the trigger. I am so glad that I did. I love the fact that I could remove the rails in my truck from my 5th wheel. Hooking up the 5th wheel was another concern, as I can not see the goose ball, but proper placement of a car antenna and magnet allowing me to see the center line of my truck and camper and as soon as the hitch hits the antenna I am centered over the ball. I love it.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


I had changed from a 2500 to a 3500 DRW that happened to include the GM puck system.

I was left with a choice: do I spend hundreds on a puck adapter system to allow my old industry standard rail fifth wheel hitch to work with my new truck? Or do I sell it for as much as I can, and change over to something like the Goosebox?

In the end, I was able to sell my old fifth wheel hitch and purchase this Goosebox, and the difference cost about as much as the adapter would have cost. Furthermore, the bed of my truck is now eternally empty and usable without needing to climb in and disassemble a heavy hitch, and I even lost a bit of weight in the bed.

Yes, the Goosebox is heavy, but it is certainly not heavIER than a normal pinbox plus the weight of my old hitch. If my guess is right, I probably lost 50-100 lbs.

To add to that, once the bag is inflated, the ride is so smooth. It's easily one of the best upgrades I did to my truck and trailer setup.

Yes, hooking up is SLIGHTLY more complex than a traditional fifth wheel, but the time difference is minutes at most. Less, once you get used to it, or you have a good spotter to help.

I kept the old pin box around, because I will want to keep this setup if I ever change trailers!




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


Great quality and easy to use. This hitch makes the camper ride so smooth on the truck. It eliminated the forward/backward chucking that happened every time we hit a bump in the road. Mutch more pleasant to drive. It is also very nice not to have a large hitch to remove from the truck. I use my truck between camping trips and the bed is open and free without lugging a 5th wheel in and out. Other people in the campgrounds constantly ask me about the "strange looking" hitch on my camper.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


After dealing with the awkward 5th wheel hitch and pin box for many years on several RV's, I decided to try the Goose Box. Absolutely the very best mod I've done on my 2019 Alpine 5th wheel.


Comments
Great. Best mod Ive made in a long time.
Sandy C - 06/20/2021


by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


Improved ride, no hitch in the box of my truck!




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


I had this hitch delivered to my RV dealer for installation. I failed to give them instructions or link to video, and there were no instructions in the box. However, it was a pretty straightforward install. I picked up the RV, aired the bag to “half” on the indicator and it rode like a dream… as I expected it would. SOO much better than using a fifth wheel to me. But then again, I’m a very strong proponent of goosenecks anyway. Been pulling trailers off and on for… let’s just say over 45 years.




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


really cushions the ride and keeps your truck bed open for hauling without removing a 5th wheel plate. Easy to install, just follow the directions




by:

Review from a similar Goose Box in Gooseneck and Fifth Wheel Adapters


Hard to come up with enough words to praise this GooseBox!
What an incredible difference switching out from my king pin. Much better ride, have lots more room in my truck bed, and the adjustability of the airbag helps greatly in tight back-up situations.



25
251
Show More Reviews

See what our Experts say about this Reese Gooseneck and Fifth Wheel Adapters

  • Troubleshooting Reese Goose Box that is Difficult to Get Off of Gooseneck Ball
    Is the release mechanism difficult to move or does it seem to work decently but the ball doesn't want to come out of the coupler? With the Goose Boxes like part # RP85FR it is recommended that you grease the pivot shaft and the hitch ball with every use. I attached a picture that shows where the grease fitting is.
    view full answer...
    Image 1 for
  • 20k or 16k Reese Goose Box for Montana 3121RL Fifth Wheel
    To be on the safe side and be sure that you can use the full weight capacity of your Montana 3121RL you'd want the 20k Reese Goose Box part # RP85FR that you referenced.
    view full answer...
  • Will the Reese Goose Box Work With a Pronghorn Flatbed?
    The Reese Goose Box # RP85FR will fit any 2 5/16 gooseneck ball. However, with all the variations that flatbeds have, there is something that needs to be kept in mind. The standard non-recessed gooseneck ball will fit without issue. If the ball is recessed, it is a little more complicated. First you will need to know how deep the ball is recessed. The coupler part of the # RP85FR is 4 inches deep and 7 1/2 inches wide at its widest point. As long as the hole, for the lack of a better term,...
    view full answer...
  • How Difficult Is It To Replace 5th Wheel Trailer Pin Box With Reese Goosebox?
    The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - Lippert 1621 and 0719 - 20,000 lbs # RP85FR is a great option as it will allow you to use a gooseneck hitch ball instead of needing a heavy 5th wheel hitch. Swapping the pin box on your 2021 Keyston Cougar 364BL will require at least one extra set of hands, as the pin box weighs almost 200lbs. Besides the weight of the pin box the installation is easy. Its just 8 bolts and nuts. To make sure the # RP85FR will fit your...
    view full answer...
  • How to Identify Your Pin Box
    I was unable to locate anything about the 251256 number you provided, unfortunately. That being said, there are other ways to identify which pin box you currently have. I included an article that lays out the needed measurements to get to the correct pin box number. With the Reese Goose Box # RP85FR specifically fitting the 1621 and 0719 pin boxes, you will definitely want to confirm which you have. But there is usually an easier way to find the pin box number. If you contact the manufacturer...
    view full answer...
  • Determining Which Reese Goose Box Fits 2021 Grand Design Solitude 3740BH
    I would be happy to help you determine if the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - Lippert 1621 and 0719 - 20,000 lbs # RP85FR will fit your 2021 Grand Design Solitude 3740BH, but you will need to confirm which pin box is on your trailer. You can do this by looking for the model number which should be located on a sticker on the pin box itself. If that sticker is missing just send me a picture of the pin box showing the brand and serial number. The # RP85FR...
    view full answer...
  • Determining Which Reese Goose Box Fits 2021 Forest River Cardinal 5th Wheel Trailer
    I would be happy to help you find the correct Reese Goose Box to fit your 2021 Forest River Cardinal 5th Wheel Trailer, but you will need to find the model of your pin box to determine the correct one. The 2020 bolt pattern you mentioned did not crossrefference to any pin boxes. To find the model of your pin box you will need to find the sticker on the pin box that has the model number, this is typically 4 digits. If you cannot locate the sticker just send me a picture of the sticker with...
    view full answer...
  • Reese Goose Box Chucking Excessively
    Thank you for your purchase from etrailer of the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs # RP85FR. In regards to the excessive chucking, the issue is very likely to be the air bag inside the coupler was not inflated properly for your ride. The Goose Box # RP85FR can have different amounts of air added to it to help with different trailer set ups. I recommend first just taking a look to ensure the air bag was not somehow punctured and inflates properly,...
    view full answer...
  • Recommended Reese Goose Box for a 2011 Montana 3400RL
    Installing the Reese Goose Box # RP85FR will depend on the pin box number of your current king pin as this is specific to the Lippert 1621 and 0719 models. If you are unsure of your pin box, however, it is definitely a good idea to verify which you have. This can be easily done by contacting the manufacturer of your trailer to ask. All you will need is the VIN and they should be able to tell you as they keep this on file. In the off chance they cannot tell you, there are other ways to...
    view full answer...
    Image 1 for
  • Will the Reese Goose Box RP94720 Fit a 2011 Keystone Raptor
    The Reese Goose Box # RP85FR is designed to work with Lippert 1621 and 0719 pin boxes, so you will need to confirm this before purchasing. There are several ways to do this if you are unsure of your pin box. The easiest way is to simply contact the manufacturer of your trailer to ask. All you will need is the VIN and they should be able to tell you as they keep this on file. In the off chance they cannot tell you, there are other ways to verify which one you have. First will be to check...
    view full answer...
  • Will the Reese Goose Box RP94720 Fit a Montana 3931fb?
    The Reese Goose Box # RP85FR is specifically designed to fit the Lippert 1621 and 0719 pin boxes, so you will need to confirm your pin box number before moving forward. This can be easily done by contacting the manufacturer of your trailer to ask which was used. All you will need is the VIN and they should be able to tell you as they keep this on file. In the off chance they cannot tell you, there are other ways to verify which one you have. First will be to check your pin box for a label....
    view full answer...
  • Recommended Reese Goose Box Fit for Lippert 1621HD OEM Pin Box
    If your 5th wheel is equipped with a Lippert 1621HD pin box, it would be compatible with the # RP94720 Reese Goose Box model you'd looked at. You can confirm fit by measuring the center to center bolt hole distance and width of the pin box itself, then compare your measurements to the diagram I've provided for you. If they match up, you do indeed have a Lippert 1621HD pin box, and the # RP85FR would work great for you.
    view full answer...
    Image 1 for
  • Can a Lippert Turning Point Pin Box be Replaced With a Reese Goose Box?
    From what I could find, the weight differences between a 16k Reese Goose Box # RP85FR and a 16k Lippert Turning Point will match each other. However, with how the Lippert Turning Point pin boxes are attached to the frame, they do not use a standard pin box number and cannot be replaced, unfortunately. I spoke with Lippert and they did confirm that is is a stand alone, proprietary pin box that they use for the Turning Point systems.
    view full answer...
  • How To Find the Correct Reese Goose Box for a 2006 Forest River Wildwood
    In order to confirm the correct Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter for a 2006 Forest River Wildwood 5th Wheel Trailer you will need to measure the pin box using the article I have attached for you below assuming the pin box sticker on the side of the pin box is no longer legible. The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter part # RP85FR is the most likely candidate which fits Lippert 1621, 1621HD, and 0719 Pin Boxes which are most common.
    view full answer...
  • Correct Reese Goose Box for Grand Design Solitude 310GK
    The Grand Design Solitude 310GK uses a Lippert 1621 pin box so the correct Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter is part # RP85FR. If you wanted to confirm, you'd simply look for the model number which will usually be on the wing set or pin box.
    view full answer...
  • Reese Goosebox RV Warranty Implicatioins
    I don't have a listing by manufacturer, but Reese tells us that Lippert approves the Goosebox for most of their frames. You'd need to ask the RV manufacturer about which of their specific models use Lippert frames, and then find out if that specific frame warranty allows the use of the Goosebox. Unfortunately, the world of RV parts isn't as cut and dried as that of passenger vehicles. The Reese # RP85FR Goosebox is a replacement for the OEM Lippert 1621, 1621HD, and 0719 pin boxes. I've...
    view full answer...
  • Will Reese RP85FR Goose Box Air Ride 5th Wheel To Goosneck Adapter Replace Lippert 1621SHD Pin Box
    The only difference between a Lippert 1621 HD and SHD is the weight capacity. A 1621HD has an 18K capacity, while a 1621SHD has a 21K capacity. As far as the bolt-up goes, there is no difference. Long story short, as long as the as-towed weight of your 5th wheel is less than the 20K capacity of the # RP85FR Reese Goose Box, it'll work perfectly for you. You can see an installation of the Reese # RP85FR Goose Box by clicking the provided link.
    view full answer...
  • Goosebox Compatibilty with Forest River Sabre 301BH
    You will want to confirm on your pin box, but it appears you have a Lippert 1621 pin box. If this is the case you can use the Reese Goose Box # RP85FR. If you can't find the number on the pin box you can call the manufacturer with your VIN or you can take some measurements. I've attached an article to assist. If you have the more recent model with the Lippert Turning Point pin box, there is not a replacement option available as it is welded to its brackets.
    view full answer...
  • Recommended Reese Goose Box Compatible with 2016 Heartland Bighorn 3270RS
    Your 2016 Heartland Bighorn 3270RS came with either the Lippert 1621 pin box or the equivalent. For your Goose Box, you will want the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - Lippert 1621 and 0719 - 20,000 lbs # RP85FR which will bolt right up. I've attached a couple videos to assist.
    view full answer...
  • Will the Reese Goose Box RP94720 Fit a 2021 Keystone Cougar 364BHL?
    Installing a Reese Goose Box is definitely a popular upgrade. That being said, the # RP85FR is specific to the Lippert 1621 and 0719 pin boxes, so you will need to confirm your pin box before purchasing. Your specific pin box number can easily be verified by contacting the manufacturer of the trailer. All you will need is the VIN and they should be able to tell you as they keep this on file. This is always my first suggestion as it is by far the easiest and quickest way. In the off chance...
    view full answer...
  • Gooseneck Adapter for 2021 Grand Design 337RLS
    To convert the pin box of your 2021 Grand Design 337RLS you'd need the part # RP85FR since your trailer has a Lippert 1621 pin box.
    view full answer...
  • Determining Which Reese Goose Box Fits A 2018 Jayco Eagle 321 RSTS
    I would be happy to help you find the correct Reese Goose Box for your 2018 Jayco Eagle 321 RSTS but unfortunately we do not have a break down of the specific components your trailer uses so we will need to identify which pin box your trailer has. Check your pin box for a white sticker with a four digit number like 1716 or 1116. If you cannot find such a sticker just send me a picture of the sticker on the pin box that has the serial number and I can use that to identify it. For an example...
    view full answer...
  • Correct Goose Box for Cedar Creek Hathaway Edition 38FBD
    The Cedar Creek Hathaway Edition 38FBD likely uses a Lippert 1621 HD pin box. If this is correct then the correct Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter is part # RP85FR. That said, you will want to verify the model number of the current pin box by looking for the info sticker on the side of the wings.
    view full answer...
  • Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter
    If you let us know what pin box is installed on on your RV we can better recommend the exact options that will fit. We have options such as the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter, # RP85FR. I think the situation is probably that you have the X5 that is for 2016-2019 models. Currently there is not one for OEM for 2021 GM OEM. You would have to change your entire under-bed gooseneck set-up and I doubt you want that expense when there are other more cost effective...
    view full answer...


< Previous
123. . .26



Do you have a question about this Gooseneck and Fifth Wheel Adapter?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate gooseneck and fifth wheel adapter information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Carrie F
Updated by:
Carrie F
Employee Justice A
Written by:
Justice A

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.