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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. King Pin Adapters
  6. 20000 lbs GTW
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

Our Price: $527.61
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Gooseneck and Fifth Wheel Adapters
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. 1-800-940-8924 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

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

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"

Item # CAB-C5G

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   (897 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.


I purchased this adapter before the note of not to be used with air ride 5th wheel hitches was added so now I am stuck with a 50lb paper weight. Don’t be me…listen to the notes that are now attached or you will spend a half hour every fuel stop retightening the adapter so you don’t lose your rv enroute.


Easy to install I set the hitch on my jd gator and used the trailer jacks to let down on the hitch. I also bolted the hitch on (just for peace of mind).After install I did a test run of sixty miles. Worked great there was no jerking or push pull motion at all, as some reviews have said.A few months lator we went on a 500 mile trip with no problems.My truck is a 3500 dodge dually diesel.Now I can pull my farm trailers and camper on the same hitch, no moving 5th wheel in and out of truck!My camper weights 13,000 lbs.


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

Carlos G.


How do you plan on installing the 4 additional bolts?

Etrailer Expert

Rachael H.


In the installation instructions Convert-A-Ball discusses the optional installation of additional bolts. However, these bolts are available only for the customer to contact the manfucturer, and are not sold individually. To gain access this is usually done by disassembling the pin box, or by drilling access holes in the plate, but this all depends on the configuration of your pin box, and if this adapter is intended to be a temporary or a permanent solution.

Joe B.


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

Raymond L.


Joe, what is the box length of your Ram?



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.


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

Walter, R.


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?


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.

Joe N.


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


Excellent Product! Less than 10 minutes to install. A true quality product, that I am glad I purchased instead of a overpriced hitches that fills up the truck bed and is too heavy for one person to lift.


easy to use, & super efficient! works exactly as described. Definitely a handy tool when one of your work trucks go down & you can adapt a different one to move the same trailer. Wonderful tool :)


Installation was easy. The product has performed very well. I would recommend this conversion for anyone who needs to convert a kingpin fifth wheel on a trailer to a gooseneck hitch.


Hitch just installed on 5th wheel. I think you should have included a tool for the 3/8" allen screws and the 4 bolts & nuts. I live in a rural area and had to do some serious hunting for the allen screws, which translates to a lot of wasted time. You should put in your instructions to predrill the holes before installing the hitch. Will have to remove hitch to drill bolt holes. Product looks great, will do truck hookup in a couple of days. Don't expect any problems


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!


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.


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.


Great ADAPTER HITCH!!!! Even though the hitch didn’t call for them, I drilled and installed the 4 bolts, for EXTRA SECURITY, and “Peace of Mind”


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

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.

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


I bought this fifth wheel adapter a year ago when I purchased a 2006 Keystone Challenger camper. It's a bigger camper (35 feet) so I put in the extra bolts right away. I pull it with my 2005 F350 with a chipped 6.0. I check it over before every trip and haven't noticed any wear or loosening. The real test will come in September when will travel from Wisconsin to Glacier.


Product and Service was great. The Adapter has made moving our 2006 Keystone 5th Wheel around a lot easier and have noticed no issues. Great Product!


Shopped around a bit before finally ordering from etrailer. Price was nearly $xxx lower than everywhere else I've looked, and only took 2 days from order being placed for it to arrive. Exactly what i needed to replaced the coupler that came on damaged on my trailer!



Gooseneck adapter still works great, couldn’t have picked a better product to pull out camper and not buy a 5th wheel hitch


Watched the tutorial video on installation, 3/4” 8 point socket doesn’t fit the square head bolts. My question…why not just switch to a standard (or metric) bolt rather than square head? I’ve never seen a square torque wrench yet it says torque it to 120.

Etrailer Expert

Brooke M.


You arent alone in finding the bolts frustrating, and I wont say its not a pain. It looks like you need a crowfoot wrench adapted to a torque wrench. I have heard of others using a crescent wrench as well.


I bought this to convert my fifth wheel trailer to gooseneck so I did not have to swap the fifth wheel hitch into the truck every time we wanted to take the RV out. Instructions were very clear, installation went very well, and it has held up very well in the year we have used it, probably 7K miles all told. One thing I did not anticipate was that the landing gear motor on the RV would have to work overtime to lift the coach off the gooseneck ball, and then lower the coach down to level it on a parking pad. It's a bit inconvenient, and I suspect the lift motor may suffer a shorter life, but it's a small price to pay for not having to forklift in that fifth wheel hitch every month.


Adapter works well. Pickup has gooseneck balls socket so not as much space taken up by regular gooseneck hitch that needs removed when not using


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.


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.


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!!


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.

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