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  1. Gooseneck and Fifth Wheel Adapters
  2. Convert-A-Ball
  3. Fifth Wheel Trailer to Gooseneck Hitch
  4. Bolts Over King Pin
  5. 20000 lbs GTW
  6. King Pin Adapters
Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter - 12" to 16" Tall - 20,000 lbs

Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter - 12" to 16" Tall - 20,000 lbs

Item # CAB-C5G
Our Price: $474.71
You Save: $208.09
Gooseneck and Fifth Wheel Adapters
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Shipping Weight: 66 lbs
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Use your gooseneck hitch to tow your 5th-wheel trailer by hooking up with this adjustable coupler adapter. Poly cushions absorb shock for a smooth ride. Adjustable height fits multiple applications. 20,000-lb GTW. 1-636-306-4830 to order Convert-A-Ball gooseneck and fifth wheel adapters part number CAB-C5G or order online at Free expert support on all Convert-A-Ball products. Great prices and Fastest Shipping for Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter - 12" to 16" Tall - 20,000 lbs. Gooseneck and Fifth Wheel Adapters reviews from real customers.
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Convert-A-Ball Gooseneck and Fifth Wheel Adapters - CAB-C5G

  • Fifth Wheel Trailer to Gooseneck Hitch
  • Bolts Over King Pin
  • 20000 lbs GTW
  • Convert-A-Ball
  • King Pin Adapters
  • Adapts Trailer
  • Adjustable Height
  • No Offset

Use your gooseneck hitch to tow your 5th-wheel trailer by hooking up with this adjustable coupler adapter. Poly cushions absorb shock for a smooth ride. Adjustable height fits multiple applications. 20,000-lb GTW.


  • 5th-Wheel-to-gooseneck adapter lets you tow your 5th-wheel trailer with your gooseneck hitch
    • Coupler bolts to your trailer's king pin and connects to gooseneck ball
  • Interior polyurethane cushions act as shock absorbers for smooth, safe ride
    • Reduce bounce and vibration
    • Minimize wear and tear on both your trailer and tow vehicle
  • Adjustable height fits multiple applications
  • Fail-safe king pin adapter has built-in, positive-lock feature to secure trailer to hitch ball
    • Steel extension handle lets you slide bar to lock or unlock coupler from outside the truck bed
      • Acts as a latch, keeping adapter secure
      • Can be replaced with a padlock (sold separately) for greater security
  • Durable, cast steel construction
  • Rust-resistant powder coat finish
  • Safety chains included
  • Made in the USA


  • Towing capacity: 20,000 lbs
  • Pin weight capacity: 4,000 lbs
  • Application: 2-5/16" gooseneck hitch balls
  • Adjustable height (from top of gooseneck ball to base of king pin box): 12" - 16"
  • Collapsed height of adapter: 15-1/2"
  • 2-Year limited warranty


  • Not recommended for use with Reese Elite Series gooseneck trailer hitches
  • Not recommended for use with factory-installed towing prep packages which use a hitch ball with an integrated locking lever.
  • Not compatible with sidewinder king pins.
    • When used together they produce two pivoting points at both the ball and the turret which is a safety hazard.
  • Not compatible with any cushioned or air ride 5th wheel king pin.
  • Not compatible with Rota Flex king pins
  • Any adapter that attaches in this way may void your trailer's warranty.

Finding the Correct Size Fifth-Wheel-to-Gooseneck Adapter

After backing the vehicle under the trailer, measure from the top of the ball in the truck bed to the base of the pin box on the trailer. This will indicate the height of the adapter that you need.

Convert-a-Ball Collar

Secure Installation

The included collar slides over your fifth-wheel trailer's king pin and is held in place with set screws. Additional, larger set screws that are mounted at the top of the coupler adapter then tighten onto the collar.

Convert-a-Ball Locking Feature

Positive-Locking Feature

This trailer coupler adapter features a simple, secure latching mechanism for safe, easy hookup with the hitch ball. The convenient extension handle grabs the sliding latch so that you can easily lock or unlock the coupler from outside the truck bed. Once the coupler is engaged, hook the handle through the hole in the sliding latch's track to ensure that it remains securely coupled. For extra safety, once the coupler is latched, you can replace the handle with a padlock (sold separately) to secure the trailer to the hitch ball during towing. Use a lock while your trailer is being stored to guard against towaway theft.

Pin Box Length

Note: There are no recommended limits to the length of pin box on which the Convert-A-Ball trailer coupler can be used.

C5G1216 Convert-A-Ball Adjustable Fifth-Wheel-to-Gooseneck Coupler Adapter - 12" to 16"

Installation Details CAB-C5G Installation instructions

Customer Satisfaction Score:

Customer Reviews

Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter - 12" to 16" Tall - 20,000 lbs - CAB-C5G

Average Customer Rating:  4.7 out of 5 stars   (772 Customer Reviews)

Use your gooseneck hitch to tow your 5th-wheel trailer by hooking up with this adjustable coupler adapter. Poly cushions absorb shock for a smooth ride. Adjustable height fits multiple applications. 20,000-lb GTW.

by: 08/22/2022

Tech guy was very helpful. Worked as should. Did have to re tighten bolts after first trip Added a bolt to hang safety chains on. Would have preferred different type of hook on safety chain. But all and all just what I wanted and needed at a good price


The Product installed with no problem. I just got back from a 900 mi. round trip to Utah. I was in elevations from 1000 ft above sea level to 9000 ft. above sea level. I It hooks up very easy and is very good compared the my old system. I would have given it a Excellent except that it (rotated) turned about 1/4 of an inch.on the king pin as you can see on the Photos. I will be drilling holes in the King Pin Extension and putting in the four bolts before I take it out again. I was suprised that I did not receive the optional bolts nor was I asked if I wanted them. .I did order on line so I accept responsibility for it. At no time did I feel any safty issues.
I had replaced the suspension on my trailer with the easy ride system and combined with your Convert-A-Ball Cushioned System my wife said there was a huge emprovement and I also felt a big difference it the Truck. It is a well engineered product and my raiting will go to Excellent after I put in the four Bolts. You can send me the bolts or I will get my own.
Attached are some photos of my Truck and Trailer.
The Trailer is a 2000 Forrest River Sierra Sport Toy Hauler.
I bought it new.
9200 Dry.
(2) 6500 lb Axels
1900 lb. on the Pin (est)

If Questions, Feel free to call

Have a Great Day

How do you plan on installing the 4 additional bolts?
-- comment by: Carlos G - 07/27/2014

I did as I said I would do and I drilled four hole in the pin box and installed four bolts. I feel much more confident in the system. I am very happy with it at this time. To drill the holes I removed the pin box and used the adapter for a pattern, I then drilled the holes by hand. 1/2 in Drill
Joe B - 07/17/2015
Joe, what is the box length of your Ram?
-- comment by: Raymond L - 10/21/2015
Raymond L.: My Ram is a 3500 4X4 SRW It has the 8Ft bed. I pulled the same Toy Hauler with two different Quad Cab PUs over the years with 6-12 ft. beds. One 2WD and one 4X4 before this one. I ordered this P/U as a Std. Cab. It is set up like a Laramie inside. towing I get 10-13 MPG. Empty 22 MPG It tows at any speed I want in the Mountains.
-- comment by: JoeB - 10/26/2015


I recently bought a 36ft 5th wheel toy hauler and needed a way to pull it, we didn't really want to install a 5th wheel hitch because we didn't want the extra holes in the bed of the truck so we bought this. I was nervous at first but this hitch adapter work very well. It mounted to the 5th wheel easily and sat right on the gooseneck ball that came built into our truck. It also disconnected from the truck with ease. We have left it hooked onto the camper for now for quick movement if needed.

I am still using the goose neck adapter, I now take it off if my camper is parked for a while just to reduce stress on the front end of the 5th wheel. I would recommend!
Lindsey - 11/01/2017


I just wanted to tell the folks at etrailer how great of an experance I had ordering from them. I ordered a 5th wheel to gooseneck adapter. From the time the phone rang until Wayne had taken my order was less than 2 minutes. These people know their stuff and the price was great. The install was flawless, fit perfect. I was kept informed several times by e mail what the status of my order was. My order came a day early even during a holiday week.
I am sure glad to have some room in my p/u bed while pulling my 5th wheel.
Thanks Wayne and thanks etrailer

Danny I notice you have a morryde pin box on your trailer. did you change the skid plate over to the morryde RPB77006 gooseneck adapter plate. to use this adapter?
-- comment by: Walter, R - 12/02/2015


Installation is a breeze. I'm a short but stocky guy so installing it by myself wasn't hard at all. I just lowered the trailer to where I had enough leverage to hold the adapter up and be able to tighten the bolts down with the other hand. Torqued everything down to spec and was on the road in no time. Pulled off after 50 miles and retorqued everything as any good transporter does. This is where my review gets bad. The bolts that hold the adapter to the kingpin couple failed. They crushed on the ends and damaged the threads. Keep in mind, I followed the torque specs TWICE. I didn't have the twisting issues that others have had. It took me 30 min with a pull bar and a piece of pipe to get the bolts backed off enough to get the adapter off the kingpin coupler. Today I spent 30 min working ONE bolt completely out of the adapter and this is what I found. I am in contact with etrailer to get it resolved. The bolts and the inner threads are damaged. Hopefully this is just a lemon and I will get a replacement hassle free. Other than this, this is a great design and towed well.

Great product but the bolt crushing problem is a major one that I am working directly with Convert-a-ball to get fixed. They admit it is on their end and we are working on
Joe N - 12/05/2016


I want to thank Etrailer for the great customer service I received. Emily H, was very helpful in the process of my purchase. The c5g _1216 converter ball adapter was a very well made and sturdy product. And will handle the 39ft toyhauler that I have it installed on. The installation was very easy and simple. So thanks again Etrailer for a great product and fast delivery, and great customer service.

Walter, R

When I first received it I thought it would work out. But after using it for a couple of months, I had to remove it. The ride quality was terrible and the jerky ride while towing was unbearable. Plus the additional stress it put on the frame of my fifth wheel trailer over time would cause even more problems. So I removed it and installed a Curt fifth wheel hitch and now the ride is much better and smoother with no jerkiness. Would not recommend this adapter at all.
Walter, R - 12/16/2016


As with the 5th wheel hitch i ordered a year ago the box it was shipped in is it real bad shape I don't know if the hardware package is in the adaptor that I received on Monday im working long days right now and won't get a chance to look in what's left of the box till the weekend I will let you know if this one needs to be returned as the 5th wheel hitch was. Strike 2

I have sent your information over to our customer service department in order for them to better assist you.
-- Etrailer Expert Katrina B - 05/24/2022


This conversion was awesome starting from the ordering then tracking to the installation and did it by myself (63 yrs old)
I’ll recommend this to all my Rv friends

Fantastic!!! No problems!
Guy S - 06/15/2020


This piece is great! I don’t have to drill any more holes in the bed of my truck to install a 5th wheel. Easily installed in about 30 minutes. I will recommend this to anyone that asks. For those looking to get one, here are the tools you’ll need to install: 19mm crowfoot 1/2” drive, 27mm crowfoot 1/2” drive, 3/8” hex 1/2” drive and a 1/2” drive torque wrench. I installed it by myself. I just back the truck underneath and lowered the kingpin down onto the adapter, after installing the kingpin ring.


I used it to pull my trailer from Nevada to Alaska “VERY rough road to say the least” it did awesome!!!! The only issue was when I went to take it off the trailer the set screws inside had backed off a bit and I had trouble getting it off … I would highly recommend this product!


Very well made adapter. Was reluctant to put on a gooseneck adapter do to the naysayers but I went ahead and purchased one and I couldn’t be happier. I installed the adapter in less than 15 minutes. I did have the needed tools on hand so that most definitely made install much easier. Pulls my 5th wheel perfectly. Highly recommend.


Etrailer has literally everything in stock the website it easy to navigate, they shipped the item quickly and it was track able. I would recommend to anyone.


Mounted easily and seems to be of good quality. The only thing I do not like about it are the square head bolts. Finding an 8pt socket so you can torque the bolts is not in most home tool boxes. Fit and Function are great and took only about 15 minutes to install.


Adapter works perfect! Ordered on Wednesday, received product on that Friday! Excellent customer service! Will be ordering my Gooseneck Hitch very soon! Thank you


the convert-A-Ball adapter was great. Easy to install and allowed us to pull our new trailer. Order was quick and complete.
Thanks for taking care of this customer.

Don - 03/09/2022


I was looking to maximize the space in my bed and didn't want a heavy fifth wheel hitch to move in and out. I reached out to the pros at etrailer and they helped me pick the right setup. I chose to go with the Curt hideaway hitch and the Convert-A-Ball. I couldn't be more happy with their service and fast delivery.


This is a great product. I’ve owned several gooseneck adapters over the years and this one is definitely the easiest to install and performs great!


I searched and searched for days to find whether I wanted to go with the fifth wheel hook up or go with the gooseneck adapter to fifth wheel. I'm still glad to this day that I made this decision to go with this adapter..It's simple and easy.. Installation was a breeze, instructions & pics to a T..Ive told everyone about this product and still talking about it I definitely recommend this product!!..


Ordered this prior to the arrival of my new Eagle RKS-313. The CAB-C5G was easy to install on the trailer, instructions were straight forward and easy to follow. One season under my belt with a Fifth Wheel, and it's been a Great one. Connect & disconnect are smooth and quick. With the hidden Goose in my Ram 3500, i have ample room for necessities to have a great week/weekend of camping. Very happy with my CAB-C5G!!


I called for tech support. They were very helpful. Our flatbed has a recessed box and they coached me how to adjust the hitch.


This product was a great way to keep the bed of my truck clear by using my flip up goose neck ball to pull my new 5th wheel. I just got back from my first trip pulling through Washington, Oregon, and Idaho and it pulled smooth and great! I had conditions from very hilly two lane roads with 6% slopes to 75mph interstates. I do have to say that the included release lever (the one you can use from the side of the truck) doesnt make any difference because you still have to climb into the truck to remove the chains. Also my truck is a F250 which sits stock a little taller and in the lowest (12") position the trailer rides at an angle up to the truck bed (photo)so a good idea to measure closely before purchase.


Quality product! Fast shipping, Fair price, Awesome communication after i placed the order. Part came a day early! Its mounted to my camper and works awesome. Thank you Etrailer. keep up the good work.


Product arrived as described. Was very easy to install, took about 30-45 minutes including reading the instructions. It would be nice if the bolts to secure the hitch to the collar, as well as the bolts used to adjust the height were a standard bolt head vrs a square head. Other than that very easy & straight forward. I like this adapter much better than having the traditional 5th wheel hitch taking up room in the bed of my truck.


Bought a truck with a heavy duty gooseneck hitch. Found a fifth wheel we wanted to buy. I ordered the CAB-C5G with 3 day shipping. It was here in 3 days! The unit was very heavy and the packaging was very well done. I read the instructions and gathered up the tools needed for the installation. We drove about 125 miles with it still in the box not knowing exactly what was going to happen. The seller and I took about a half hour to install it on the trailer and a few more minutes to adjust it in his driveway. Once we got it out on the road we noticed the trailer was front high. We took about 20 more minutes in a parking lot to make the final adjustments. My truck is a 2011 GMC 3500 single wheel so it is pretty high.
On the road we experienced no problems on the 125 mile trip home. I was a little skeptical about how this would feel going down the road but after a little while we were doing the speed limit at 70 mph on route 93 South in NH coming out of VT. We stopped after 50 miles or so to check the torque on the bolts and it was fine.
This adapter was supposed to be a short term fix until I could figure out a fifth wheel setup with the given hitch, but I think I just may like this on a longer term. With the fold over ball, I can use the bed of the truck without having to remove a big heavy hitch. This adapter is HEAVY DUTY, emphasis on heavy! Hooking up you have to have the trailer a little higher than normal to clear the ball height. Also yo do not have the luxury of the 5th wheel to guide you in if you're a little off. Mostly pros with this unit, can't come up with any cons. Great product and I would recommend it.


the hitch arrived in 3 business days as promised via UPS. It weighing over 70 pounds I expected the cardboard box to be thrashed. The box arrived in perfect shape, great job on packaging . I immediately ran out and and began installing it on my trailer. Things went terrible, I had the white line on the collar facing forward per the video and the instructions; it just wasn't lining up when I slipped the hitch up. Plus it would not go up and seat to the king pin plate. I called customer service and they were going to have a technician call me. I started taking the collar off and that's when I discovered I had installed it upside down?? I flipped it over reinstalled it and the rest of the installation went perfect as per the instructions. If I had not of made that error the whole thing would have only taken about 15 minutes.
I felt kinda stupid because the collar is stamped this side up and has an arrow. None the less I called customer service back and told them of my error and cancelled the technician callback request.
Great product, love the additional bed space I gained by going to the turnover ball with the etrailer adapter.

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