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  1. Gooseneck and Fifth Wheel Adapters
  2. etrailer
  3. Gooseneck Trailer to Fifth Wheel Hitch
  4. Replaces Inner Tube
  5. 25000 lbs GTW
  6. Gooseneck Coupler Adapters
Gooseneck to 5th Wheel Trailer Coupler Adapter - Inner Tube - Round - 25K lbs

Gooseneck to 5th Wheel Trailer Coupler Adapter - Inner Tube - Round - 25K lbs

Item # KPG5-R25-IP
Our Price: $138.35
You Save: $11.70
Gooseneck and Fifth Wheel Adapters
This item qualifies for Free Shipping
Shipping Weight: 42 lbs
In Stock
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King pin coupler allows you to pull your gooseneck trailer with a fifth-wheel hitch. The height easily adjusts to fit your application. Round inner tube is included, heavy-duty load-bearing pin (GCPN-PIN) is sold separately. 1-800-940-8924 to order etrailer gooseneck and fifth wheel adapters part number KPG5-R25-IP or order online at Free expert support on all etrailer products. Great prices and Fastest Shipping for Gooseneck to 5th Wheel Trailer Coupler Adapter - Inner Tube - Round - 25K lbs. Gooseneck and Fifth Wheel Adapters reviews from real customers.
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  • Reviews (387)
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  • Why etrailer?

etrailer Gooseneck and Fifth Wheel Adapters - KPG5-R25-IP

  • Gooseneck Trailer to Fifth Wheel Hitch
  • Replaces Inner Tube
  • 25000 lbs GTW
  • etrailer
  • Gooseneck Coupler Adapters
  • Adapts Trailer
  • Adjustable Height
  • No Offset

King pin coupler allows you to pull your gooseneck trailer with a fifth-wheel hitch. The height easily adjusts to fit your application. Round inner tube is included, heavy-duty load-bearing pin (GCPN-PIN) is sold separately.


  • Gooseneck-to-5th-wheel adapter lets you tow your gooseneck trailer with a 5th-wheel hitch
    • Round inner tube fits most standard, round gooseneck outer tubes
  • Adjustable height to fit your application
  • Sturdy steel construction
  • Heavy-duty load-bearing pin (GCPN-PIN) is sold separately
  • SAE J2738 compliant


  • Tube diameter: 3-15/16"
  • Range of vertical adjustment: 8"
    • 2-11/16" From center of hole to center of hole
  • Pin hole diameter: 7/8"
  • Plate dimensions: 10" long x 10" wide
  • Weight capacity: 25,000 lbs
  • 1-Year warranty

Dimensions of coupler plate

KPG5-R25IP Ram Gooseneck to 5th Wheel Trailer Coupler Adapter Inner Tube and Pin - Round - 25,000 lbs


Customer Satisfaction Score:

Customer Reviews

Gooseneck to 5th Wheel Trailer Coupler Adapter - Inner Tube - Round - 25K lbs - KPG5-R25-IP

Average Customer Rating:  4.8 out of 5 stars   (387 Customer Reviews)

King pin coupler allows you to pull your gooseneck trailer with a fifth-wheel hitch. The height easily adjusts to fit your application. Round inner tube is included, heavy-duty load-bearing pin (GCPN-PIN) is sold separately.


Makes for a more stable hitch with the Ram Puck System, don't hear of feel the gooseneck down pipe flexing, makes hooking up easier in that I don't have to get up into the bed to close and lock the gooseneck lock. Yeah, glad I went this way. Easy install.


Super Deal and CUSTOMER SERVICE.Ya'll got my bussiness !.
The RAMPS are off tha CHAIN " Just what tha DR. ordered " No more " HEMMORIDS ".


The hitch looks great, just what we needed, and as what has become typical with your company, it arrived sooner than expected!! First Class Service!

Hitch has worked out great as expected, no issues.
John H - 08/28/2022


Nice part, meet all my expectations and fit my gooseneck car hauler to make it work with the 5th wheel plate on the toter. We were in a crunch and etrailer got it to us in two days! Although the pack could've been better, there was only sherds of a box left when we got it.


Good price, fast shipping, smooth trans action.


Worked great !


Works great. Really enjoy the ease of hooking my goosenecks to the semi now. Would buy again.


Awesome, I’m on the road so I won’t be able to install and send photos for a few weeks.


Like the king pin don’t have to change my 5th wheel hitch Rv style to ball
Hitch like it a lot no problems using this kind


Took about 2 minutes to change out and worked excellent


Product had some sharp edges that I easily ground clean. I have not used this adapter yet as my trailer towing plan had changed. However I will keep for future towing of gooseneck trailers. I think it is well built and will handle the task it is intended. This adapter is a good tool to have in your arsenal when the towing of gooseneck trailer with a fifth wheel hitch.


Works great. saves me from removing my fifth wheel hitch to pull my gooseneck trailer since i use my fifth wheel for work it is always in the bed of my truck. Others i have looked at are smaller if you are planning on carring it in your toolbox for multiple trailers but for my application it works great i prefer the bigger pad since my trailer has a lot of tounge wheight thanks again etrailer


If you know how much easier it is to hook and unhook from a fifth wheel than to lower and raise from a gooseneck then you will absolutely love changing your trailer with this adapter. After a year it has made life with my race trailer so much faster loading and unloading every weekend.


Paid a few bucks extra to get it here in two days. Actual price for shipping was less then the quote while buying, that was awesome. Minor detail was the fact that my trailer pin holes were not in perfect alignment with the world, but it really does not matter once its hooked up. And on top of that, anyone buying this hitch, is not hooking to a 40,000 lb trailer and needing the truck to raise the trailer. Hitch is fine just not 100% straight to the world.

This is an amazing part. Yes its bare metal and yes there are a few sharp edges that could be cleaned up. BUT, if you are looking for a show piece then buy the one that cost $300.00 bucks.

If you want quality and functionality then this kingpin adapter is amazing. I will swap this adapter every time I hook to a crappy goose-neck bone shaker.


easy install looks to be good quality


It was very easy to install and is of good quality. I’m very happy with my purchase.


Was wanting to change my three trailers from gooseneck hitches to 5th wheel king pin hitches. Researched and found etrailer who kindly put up an informative video about there product, application & installation. I ordered the conversion hitch, received it quickly just as I ordered it. Installed it, and am very pleased with this conversion hitch. I also had some other trailer issues and found everything I needed on there friendly web-sight.


Great product. Very well constructed and easily exchanges with my goose neck ball reciever.

Great product and service was outstanding.
Robert E - 03/23/2018


Although the first shipment of the gooseneck to fifth wheel hitch was not what I had ordered. After a quick phone call to Etrailer they emailed the return information and I received the correct part thre days later.


I am very happy with this purchase

The hitch works great plus easier and quicker than using the original gooseneck hitch
Berlin - 12/27/2021


This makes hooking up my trailer so much easier than the goose neck. Easy to install since i already have a 5th wheel hitch in my truck. All it took was a little paint to match my trailer and ready to roll. On took like 4 days to get my order. Will be getting more products from them in the future.


For the price you would think the product would have been painted or powder coated other than that I enjoyed the product the hitches work great.

Thank you for building a very Superior product!


Order came quickly. Web page easy to use. Bought adaptor to convert goose neck to fifth wheel. Adapter in order to plug in trailer lights/brake plug into my truck. Adapter cheaper than making one from scratch.


Works great. Allows us to use the 5th wheel hitch for both the horse trailer and 5th wheel. Easier fir myself to hook up as well.



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