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  1. 5th Wheel Gooseneck Adapter
  2. Reese
  3. Fifth Wheel Trailer to Gooseneck Hitch
  4. Replaces King Pin
  5. King Pin Adapters
  6. Fabex 600
  7. Lippert 0719
  8. Lippert 1621
  9. Lippert 1716
  10. Lippert Rhino
Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs
Reese

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

Part Number: RP85FR
In Stock
$1,774.38
Retail:$2,423.62
You Save: $649.24
5th Wheel Gooseneck Adapter
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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. 1-800-940-8924 to order Reese 5th wheel gooseneck adapter 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. 5th Wheel Gooseneck Adapter reviews from real customers.
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Reese 5th Wheel Gooseneck Adapter - RP85FR

  • Fifth Wheel Trailer to Gooseneck Hitch
  • Replaces King Pin
  • King Pin Adapters
  • Reese
  • Fabex 600
  • Lippert 0719
  • Lippert 1621
  • Lippert 1716
  • Lippert Rhino
  • 20000 lbs GTW
  • 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: 4,000 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 Satisfaction Score:


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   (281 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:

Huge difference in not only allowing me to utilize my truck bed once I’ve unhooked my fifth wheel, but I feel the ride is improved. Great company in helping me complete this changeover



by:

Installation was a breeze. I have not towed with it yet, but am sure it will perform as expected.



by:

Hitch is great. Delivery went well. My only issue is I was able to find it for roughly $xxx cheaper on [online]. When I reached out to customer support to let them know, they told me it was too late to cancel the order and if I’d like, I can return it for a $xxxx shipping fee…



by:

Mark

10/7/2024

This was a great investment. Just got back from Alaska 13,500 miles and it worked great, no isues at all. I would highly recommend this hitch We pull a 35 Montana.



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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.



by:

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:

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:

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:

Not As Advertised and Horrible Customer Service at Reese!
The pinbox came without installation hardware or directions. The hardware took a month to replace and again came without directions.
The pinbox DOES NOT have the air valve as pictured. When I called Reese I was told it was due to a parts shortage and the person I spoke to told (Paul) me the new set-up was a dumb design.
I TOTALLY AGEE!!
To inflate one person has to literally crawl under the pinbox while hitched to inflate while another watches the bar. Not easy for a 60+ year old fat man!
The valve faces OPPOSITE the bar side. Just dumb.
When etrailer followed up they were basically told I have to live with it.
NO - NOT HAPPY!



by:

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.



by:

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!



by:

THIS IS THE THIRD FIFTH WHEEL HITCH THAT I HAVE HAD SINCE 2016. IT IS HANDS DOWN THE BEST HITCH I HAVE HAD AND SEE NO OTHER REASONS TO MAKE ANY FURTHER HITCH CHANGES IN THE FUTURE. THE REASON I GAVE IT 4 STARS IS BECAUSE OF THE LIST OF IMPROVEMENTS THAT I HAVE LISTED BELOW. I HAVE HAD THE HITCH FOR 1 YEAR AND HAVE PUT APPROXIMATELY 10,000 MILES ON IT.

WHAT I LIKE:
-IMPROVED THE TOWING EXPERIENCE IN TERMS OF RIDE COMFORT WHEN
TOWING
-UPON DISCONNECTING FROM THE CAMPER, THE ONLY THING LEFT IN
THE BED OF THE TRUCK IS THE GOOSE BALL.
-REDUCED CHUCKING. IT ELIMINATES ABOUT 90%

WHAT NEEDS TO BE IMPROVED:
-THE COUPLER ON THE KING PIN NEEDS TO HAVE A FUNNEL (similar
to the Anderson hitch) THIS PROVIDES A MARGIN OF ERROR WHEN
RECONNECTING THE TRUCK TO CAMPER. WITH THE CURRENT COUPLER,
YOU HAVE TO BE DEAD ON WHEN RECONNECTING. A CHEAP ACCESSORY
TO HELP IN THE ALIGNMENT OF KING PIN TO THE GOOSE BALL ARE
TELESCOPING TENNIS BALLS.
-EASIER ACCESS TO PUTTING AIR IN THE AIR BLADDER. IF I KNOW
THAT I NEED TO PUT AIR IN THE BLADDER, I WILL DO IT WHILE THE
CAMPER IS DISCONNECTED FROM THE TRUCK. I FOUND IT EASIER TO
LET AIR OUT THEN TO PUT AIR IN WHEN THE KING PIN IS CONNECTED
TO THE GOOSE BALL

THERE ARE SOME GOOD VIDEOS ON THE INTERNET THAT HAVE GOOD TIPS AND TRICKS THAT MAKE USING THE REESE GOOSE NECK EASIER. THIS IS ONE OF THE BETTER ONES.



by:

Installed very easily on my Grand Design 31MB, Towing with a 2019 F350 short box and have about 7" of bed rail clearance once the box is aired up. Using the B&W 4" offset, can get close to 75-80 degree turns

Hardest part was tracking down a 220lb torque wrench to get all the bolts secure.



by:

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.



by:

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:

Goosebox works great! We have a bradford built flatbed with a recessed ball. The truck is used for work when not pulling the fifthwheel so I didn't want to cut out the trap door cover to use an anderson. The goosebox makes the fifthwheel no different then hooking up a regular gooseneck trailer but gives a much smoother ride



by:

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:

I finally reached the point where I could no longer remove my standard fifth wheel hitch by myself. My only option was to leave my hitch in the bed of my truck for the entire travel season, April to October for us. Not a good thing when I needed my full bed. After hours of research the Goose Box seemed to be my best option. I had put the Box on our previous fifth wheel but didn't tow it much before we traded it for a 2020 Jayco Pinnacle. I had the dealer change the Box over to the new Jayco. It is by far the best towing, best riding and best handling fifth wheel/truck combo we have ever owned, and that has been a few. Our 2020 F350 has the camera system which makes hookup relatively painless. The 5 pound ball is so much easier to remove than a 200 pound hitch. Well worth the money and highly recommend it.



by:

Ordered this to replace OEM king pin on my 2019 Solitude 375RES. Due to it being delivered via freight it took a little longer than expected, had to make an appointment to have it delivered, not to big of a deal. The cardboard this comes in is very hefty, as it should be for the weight of the item. As stated by other, there was not any instructions included, easy to find online though. I am not the mechanical type but a little handy with basic tools and it took me about 2.5 hours, this includes taking the old pin box off. Watched a few videos on how people used wood blocks and used the tailgate of the truck to install. I was worried about braking the zerk fitting off so I attached the couple to my goose ball. I than used blocks of wood to shore it up and used the truck and the fifth wheel to line it up. Hooking up is easy. On my test drive I can tell this will handle better, did not have as much chucking as with the fifth wheel hitch. Looking forward to our next camping trip to give it a true test.



by:

After one year of use the Goosebox has been a joy to pull with. Initial hookup is a learning curve compared to a traditional 5th wheel hitch but simple and quick after a few trips. Found a bed mounted camera eases the hookup process and
love the open space of our truck bed when unhooked!



by:

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.


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See what our Experts say about this Reese 5th Wheel Gooseneck Adapter

  • Options for Towing A Fifth Wheel With A 2022 F-350 Short Bed With OEM Puck System
    With a 2022 F350 short bed, hitting the top of the bed rails should not be an issue with most campers. Turning clearance however, will certainly be a factor. That is one advantage of the Andersen Ultimate hitch # AM3200, as it provides a 9" offset. It is also very light (40 lbs) and will by far be the easiest to manage by yourself. Any other hitch is going to be at least quadruple that. For example, for your truck we would generally recommend a B&W companion hitch # BWRVK3370. Extremely...
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  • Is An Offset Ball Needed For The Reese Goosebox In A Short Bed 2014 Ram 3500 Dually
    With a short bed truck it's definitely recommended that you use an offset ball to try and prevent the nose of the trailer from contacting the cab of the truck when making tight turns. The Gen-Y Hitch Gooseneck Trailer Hitch # GY83XR provides a 5" offset so you're correct in choosing it. The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR should clear the tailgate without a problem, but you may still have issues with turning clearance even with offset ball. Newer...
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  • Will Reese Goose Box Allow Short Bed Truck Enough Turning Clearance
    While you do have a longer short bed truck on your 2023 Ford F-350 whether or not a Goosebox like part # RP85FR or the Gen-Y # GY98GR would provide enough turning clearance comes down to the nose style of the trailer you have. If it's a tapered nose you would be fine but if it's square at the nose and 8 foot wide it would be pretty tight and you'd be limited.
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  • How Much Does the Gen-Y and Reese Goose Box Weigh?
    Your picture didn't come through so I can't tell you if you need shim plates but I can confirm that both the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box item # GY58FR and the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter item # RP89FR fit the 1621 pinbox. So if your Keystone Fuzion 379 has a 1621 pinbox either of them will work. The Gen-Y item # GY58FR weighs 162 lbs. The Reese Goose Box item # RP85FR weighs 170 lbs. I recommend going with the Reese over...
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  • Will the Reese Goose Box Adapter for Lippert 1716 Work with Mega Cab
    The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter part # RP85FR is about the same size as the standard pin box it's designed to replace so you won't gain cab clearance but you won't lose any either. It mounts to the same holes as the original as well so the height adjustment will be very similar. That said, I have attached a full dimensional drawing below as well so you can be certain it will work for you. If you are replacing a Lippert 1716 pin box, you will need to...
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    Image 1 for
  • Recommended 20,000 lbs Goosebox for a 5th Wheel Trailer w/ a 1621 Pin Box
    Thanks for the pictures and the additional information! I just spoke with my rep at Lippert and your 2021 337RLS Grand Design Reflection 5th Wheel has a 1621 Pin box. You will want the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter item # RP85FR . This goosebox has a 20,000 lbs capacity and includes everything needed to install it on your trailer. You will not have to purchase additional spacers. You will need safety chains as they are not included. I recommend the...
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  • Recommended Goose Box for a Lippert 1621 Pin Box
    Thanks for the pictures! I would be happy to help you find the correct pin box. I just spoke with my rep at Lippert your 2017 Eagle HT 27.5RLTS has a standard 1621 pinbox with a 15,500 lbs capacity. You will need the Reese Goose Box item # RP85FR you were looking at. This pin box has a 20,000 lbs capacity so it will work perfectly on your 5th wheel trailer. I have linked an installation and review video below so you can see the steps taking to install this pin box and its functions. You...
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  • Recommended Reese Goose Box for a 1621 Pin Box
    No, it will not but I have one that does. It is the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter item # RP85FR. This one does fit the 1621 pin box. I have linked an installation video below to show you how to get it set up. You will also need the Reese Safety Chain Kit with Clevis Hooks item # RP49151. You have to use safety chains with a gooseneck connection and they are not included with the goose box. The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter...
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  • Replacement Pin Box For Switching To a Gooseneck Ball Connection On 5TH Wheel With Lippert 1621 18K
    The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR is going to be your best option as the Gen-Y pin boxes you found are not yet certified by Lippert to not void their frame warranty. You will need the Safety Chain Kit # RP49151 since you are switching to a ball connection. If you prefer to go with the Gen-Y and are not worried about the warranty then you will need to find the tongue weight of your trailer. The Gen-Y Hitch # GY58GR which is rated for a tongue...
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  • How to Determine If Reese Goosebox On 2022 Jayco Eagle Will Allow 90 Degree Turns 2022 Ram Short Bed
    You will find the frame tag on one of the arms which the pin box mounts to on your 2022 Jayco Eagle 335RDOK. It does appear this is going to use the Lippert Rhino pin box which the Reese Goose Box # RP85FR will fit. You will also need a set of Safety Chains # RP49151 with changing to a hitch ball connection. To verify your clearance I do have some measurements to help you determine you will have the clearance you need. The Reese Goose Box is going to be 19-1/4" from the front mounting...
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  • Is there a Goosebox or 5th Wheel to Gooseneck Adapter for a Turning Point Pin Box?
    Thanks for the information! I just spoke with my rep at Lippert and your 2023 Reflection 150 series has a Turning Point pin box. There is only one option to replace a Lippert, which is now Curt, Turning Point. You will need the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box item # GY48GR. The Gen-Y Pin Box item # GY48GR is not covered under Lippert's chassis warranty. The Reese Goosebox is the only one that is and Reese does not make one to replace the Turning Point. This chassis...
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  • Reese Goose Box Gooseneck Adapter that Fits 2024 Jayco Eagle 29DDB
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  • Goosebox/Pin Box Size For A 2023 Forest River Cherokee Arctic Wolf 291RL
    I can certainly point you in the right direction. Unfortunately we are not able to reference the LCI item number to determine the pin box size. In a lot of cases Lippert will not list the pin box size. The best way to determine the pin box size will be to have you measure the pin box width, horizontal distance, vertical distance, front row to king pin, rear row to king pin and bolt size. I have linked our pin box measuring guide below. Once we know the size we will know what goosebox to...
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  • What Is Different About The 3rd Gen Reese Goose Box Compared To The Previous Gen
    I can confirm that the Reese Goose Box # RP85FR is the 3rd gen Reese goosebox. The main changes from the 2nd gen are the placement of the inflation valve, and the design of the wings. The 3rd gen wings are slightly smaller than the 1st and 2nd gen, and the air valve is now on top of the goosebox, instead of up underneath. This helps to make the valve more accessible and allows the goosebox to fit additional pin box bolt patterns. The # RP85FR will now fit the Lippert 1621, 1716, 0719, Rhino,...
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  • Which Goose Box for a 2022 Grand Design Reflection 31MB?
    I just spoke with Lippert and your 2022 Grand Design Reflection 31MB has a 1621 pin box. You will need the Reese Goose Box item # RP85FR you were looking at. This Goose Box has a 20,000 lbs capacity which will be more than enough for your Reflection. The Reese Goose Box is endorsed by Lippert Components Inc. and will not affect the warranty on their trailer frames. I have linked an installation video below. You will also want to get the Tow Ready Safety Chain Kit with Clevis Hooks -...
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  • Solution for 5th Wheel to Gooseneck Adapter on 2020 Keystone Alpine 5th Wheel
    If you want to tow with a gooseneck hitch the only option will be to replace the pin box with one like the Gen-Y # GY58GR. None of the adapters like the Convert-A-Ball are compatible with a cushioned or air ride pin box. The Gen-Y 5th Wheel to Gooseneck pin boxes are also designed for long bed trucks, so clearance will be an issue. Use of an offset ball can help you gain clearance, but it is still unlikely you will be able to make a sharp 90 degree turn. I'm not sure if you have a Chevy/GMC...
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  • Reese Goose Box Options For a 2022 Keystone Montana 3121RL With 1116 Pin Box Mounting Flange
    You will need the Reese Goose Box # RP85FR with the Spacer Kit # RP97FR for your 2022 Keystone Montana 3121RL 5th wheel. The tags on your 5th wheel helped me to determine you have the 1116 mounting brackets. You could also use the Goose Box # RP94716-61301 but you will then limit your 16,350lbs GVWR down to only 16,000lbs. Either of these will also require the Safety Chain Kit # RP49151 since you are switching to a ball connection.
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  • Recommended Gooseneck Adapter For a 2021 Forest River Salem Hemisphere 5TH Wheel Camper
    I recommend the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR for your 2021 Forest River Salem Hemisphere 5th wheel camper with 1621 pin box. This is currently the only 5th wheel to gooseneck adapter that will not void the chassis and other warranties on your camper. It is rated for campers up to 16,000lbs with a tongue weight capacity of up to 3,200lbs. The Reese Safety Chain Kit # RP49151 is required since you are switching to a ball type connection. If...
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  • Reese Fifth Wheel Sidewinder Kingpin for Grand Design Solitude and 2022 Ford F-350
    Your Grand Design Solitude will have a Lippert 1621 pin box, and since your trailer has a 16,600 lb GVWR, you'll need the 20k Goose Box, which is the following part number the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR. Since your 2022 Ford F-350 did not come with the OEM prep package you'd need a custom fit rail kit like the Curt # C79BR which will minimize drilling and install much quicker than universal options. You'd then need a fixed hitch like the Curt...
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  • What is the Difference in the 3rd Generation Reese Goosebox?
    There are a couple of major differences in the 3rd generation Reese Goosebox item # RP85FR over the prior models. First and foremost it now fits the Lippert Rhino pin box. This pin box is more common now than ever and 5th wheel owners will finally have a gooseneck adapter option that will not void their warranty. Visually the biggest change will be the removal of the taller wings. Reese has changed the angle of the entire goosebox to remove the deeper drop look to a more streamlined appearance....
    view full answer...
  • Recommended Offset Ball for Clearance w/ a Short Bed Truck and a Reese Goose Box
    Congrats on the new hobby! A Reese Goose Box like item # RP85FR doesn't do much to help you with clearance and you will want all the help you can get with a short bed truck. You have two options to get more clearance when turning or backing in with your 2018 Ram 3500 with a 6-1/2' bed and I have listed them below: The first option, and the one I highly recommend if you don't already have a Reese Goosebox, is to not change out the king pin on your 2021 Alliance Paradigm 340RL and use a...
    view full answer...
  • Weights of Reese Goose Box, Curt Q25 5th Wheel Hitch, and Gen-Y Fifth Wheel Pin Box/Adapter
    The Gen-Y Hitch Shock Absorbing 5th Wheel Pin Box # GY68GR weighs 155 lbs. The Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box # GY38FR weighs 162 lbs. Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR weighs 195 lbs. The Curt Q25 5th Wheel Trailer Hitch for Chevy/GMC Towing Prep Package # C97FR weighs 159 lbs.
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  • Recommended Offset Gooseneck Ball for a 2024 GMC Sierra 3500 w/ the Factory Puck System
    You're welcome Mike! The Reese Goose Box item # RP85FR is not going to help you with your turning clearance. Since your Sierra has the shorter 6-3/4' bed and the puck system, I highly recommend using the Gen-Y Hitch Gooseneck Trailer Hitch item # GY55XR you referenced.
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  • Should I Replace My Pin Box Bolts If They Have Been Re Used Several Times?
    Yes it would definitely be a good idea to get new bolts. We will generally see folks re use the bolts once. It does depend on the condition of course, but if they have been re torqued 3 or more times I would certainly be hesitant to re use them. We offer the Gen-Y bolt kit # GY86FR that we have used with Reese Gooseboxes in the past. Bolt kits are generally inexpensive and it is certainly a worthwhile investment.
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Used Picture for Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs

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Notes: May have damaged packaging or minor cosmetic blemishes.

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