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If you already have a fifth-wheel hitch but need to tow a gooseneck trailer, this adapter makes it easy. The Gooseneck to 5th Wheel Trailer Coupler Adapter - Inner Tube - Round - 25K lbs connects your gooseneck trailer to your fifth-wheel hitch without any complicated conversion. It lets you keep one hitch setup and still handle both trailer types, so you don’t have to swap or store bulky hardware between jobs.
Built with sturdy steel, this coupler tube is made to take on tough pulls. It’s SAE J2638 compliant and rated for a 25,000 lb weight capacity, giving you the strength needed for loaded trailers without worrying about flex or fatigue. Whether you’re hauling equipment or livestock, the solid build keeps things reliable under pressure.
Different trailers sit at different heights, and this adapter gives you the flexibility to match that. The tube offers an 8" range of vertical adjustment with precisely spaced holes—2-11/16" from center to center—so you can fine-tune the fit between your trailer and hitch. Once pinned in place, it locks in solid for confident towing every time.
The round inner tube is designed to fit most standard 4" round outer tubes, making setup simple. One reviewer mentioned installing it in about ten minutes—just slide it into your gooseneck coupler, line up the holes, and secure it with the heavy-duty load-bearing pin (sold separately). Because it comes unpainted, you can paint it yourself to match your trailer for a clean, finished look.
Once you’re finished hauling, pull the pin and slide the adapter out—your truck bed is clear again. With no bulky fifth-wheel base left behind, you can use your bed for loading gear or other work without obstruction. It’s a straightforward way to keep your setup flexible and ready for whatever comes next.
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews
Thus hitch works great, much quieter and more solid than previous setup. I needed more flex and articulation and this hitch definitely did the trick.
Makes trailer sit up high
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.
Got it in 2 days and it is a perfect fit and hookup to my fifth wheel.
Well works great but trailer to high
Easily installed, worked perfectly with no problems
Purchased this product for our work trailer, The product arrived very quickly and fits in the gooseneck nicely and very robust. later this month we will be moving the trailer and will be able to give a better review at that time, overall very happy with the purchase.
Was raw steel straight from fab shop rusty and needs painted but built very strong
Deliver as promised
Great product.
Good hitch
The only thing I had to do is cut my hitch on the trailer to make the trailer level when connected to the truck.
I couldn’t use this for my trailer, no fault of the product. My trailer would have been to tall in the front in. Product was well built. I let a friend have the coupler for his trailer.
This thing worked just like it should and that’s why i bought it from yall. Back when i was younger and trying to pinch a dollar i would shop around and spend a few bucks less but it always got me bit in some form or another. After all the different items i have purchased from yall i found that you always have great items or you wouldn’t sell them. Most of the things i purchased trying to save a dollar are in the greenhouse warehouse ( junk pile). Thanks again for always having what i need when i need it at a fantastic price.
Well built, durable. Bought 3 of them, 1 for each trailer! Painted to match my trailers. Hard to find quality products with a competitive price in today's economy. Will buy again if need arises, have regarded highly with others seeking alternative coupling solutions.
Very good quality, however trailer was so nose high it was not even close to working with my trailer...have to remove the 5th wheel hitch and put gooseneck ball in the puck system.
As always, I love the service and fast shipping I get from etrailer. And their prices always beat their competitors. Amy J is amazing and always follows up quickly to see if I’m happy.
Item is cheap, but it’s what I needed.
Shipping was fast and communication was very good!
This is not a Bulldog Brand Adapter. I thought I was purchasing Bulldog, however this brand is RAM. Nonetheless, it fit into my Bulldog upper tube perfectly. I dislike that it didn't have a primer or base coat of paint on it, but some Rustoleum self etching primer will do the trick and I'll put some black on it on a warmer day.
Will need to return this. Makes the horse trailer way too high in the front to be towed safely.
Works great now I can backup and hitch without getting in and out of truck many times I can now leave my fifth wheel hitch in truck instead of taking it out to use the ball should have done this years ago
Does not work. Makes front of flatbed trailer too high & ramps won’t land. And I had it blasted and painted before installing. Wish the weld was flat on 5th wheel plate.
Gwendolyn Y.
1/30/2025
Hey Glenn. That is definitely not the outcome we want you to experience. I have a few questions to see if we can get this leveled out for you. Are you on the bottom hole of the coupler? If not, is the inner tube bottoming out and not allowing you to use the bottom hole? Is your 5th wheel hitch on the lowest adjustment? If you are on the bottom hole and at the lowest adjustment, I have a few possible solutions but I want to start here. let me know when you can.
Shipping was fast. Experience with e trailer was good as always. Part was not so impressive. Plate where welded onto tube was not in line with the holes causing the hitch to not align with the trailer. Other than alignment hitch adapter looks and feels sturdy and robust.
Brooke M.
3/12/2025
While certainly not the prettiest, this adapter is definitely strong! Thanks for sending in the photos, too. That property looks gorgeous! Is that your land or a campsite somewhere?
the product was ideal, easy to install, and worked perfectly.
we use to on my Freightliner truck which has been set up to haul our RV,hence the 5th wheel hitch on it.
We have been using a different truck to haul hay.
This will now allow the use of my 32 foot flatbed on my freightliner truck.
Received my gooseneck adapter quickly and was everything I hoped for!product comes unpainted which I preferred so I could paint it myself to match my trailer. very easy to install in 10mins now I can pull my gooseneck and fifthwheel camper without changing out hitch thanks etrailer!
Isaac
8/6/2025
After a year of continuous use, I am still very happy with the product!
Gwendolyn Y.
8/6/2025
Info for this part was:
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Ron B.
8/24/2023
Excellent, I converted all my goosenecks to fifth-wheel kingpin setups. While the fifth-wheel hitch takes up more room in the bed than the gooseneck ball, the fifth-wheel couples and uncouples without having to get up into the bed. Additionally, with this setup, I no longer get the sway when braking or hard accelerating that comes with a gooseneck. This is true on all four of my four formerly gooseneck trailers.