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The built-in automatic slider gives you 14" of extra clearance for slow-speed turns, so you don’t have to hop in and out of the truck to pull a release lever. The rack-and-pinion gear system does the work for you, smoothly moving the hitch head toward the tailgate as you turn and back toward the cab when you straighten out. It’s a seamless way to clear tight campground corners and parking spots without any binding or jerking.
The premium single-hook, wraparound jaw completely surrounds the king pin for 360-degree contact. That solid steel design, reinforced by a 3/4" thick locking bar, keeps the connection tight and quiet mile after mile. There’s no rattle like with slide-bar jaws—just a firm, confident link that holds steady even when towing heavy 5th wheels up to 21,000 lbs GTW with a vertical load limit of 5,250 lbs.
The double-pivot hitch head moves both front to back and side to side to help reduce jarring and make hitching easier. Three polyurethane dampeners inside the head absorb road shock and cut down on noise so towing feels calm and stable. The head pivots automatically when coupling, lining up with your trailer’s pin box for easier hookups on uneven ground.
Getting your trailer level is simple with three hitch height options—15-1/2", 16-3/4", and 18-1/4". You can fine-tune your setup to get proper bed rail clearance and stable handling. Once adjusted, the sturdy steel side plates bolt into place to lock your setting in solidly for consistent towing performance.
When it’s time to use your truck bed for something else, this underbed setup makes removal straightforward. Turn the handles to release the feet from their receivers, pull the safety pins, and lift the hitch out. With no rails left behind, you get full use of the bed again until your next trip. It’s a clean, practical setup that balances strength with everyday truck use.
This fifth-wheel trailer hitch is not compatible with Sidewinder or Revolution king pins. Do not use any device that changes the pivot point of your trailer's king pin with this hitch.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer.com, and today, we're gonna take a look at this Underbed Rail and Installation Kit for the Demco UMS 5th Wheel and Gooseneck Trailer Hitches. Now, this is a custom fit kit that is designed to fit various years and versions of the GMC Sierra and Chevrolet Silverado. To confirm that this is going to work for you, please take advantage of our vehicle fit guide here at etrailer.com, input the year, make, and model of your truck, and our fit guide will let you know if this kit will work for you or if we have something comparable that will work for you. Taking an overhead look here, this installation kit is designed for use with the Demco UMS 5th Wheel and Gooseneck Trailer Hitches. These underbed rails are not exposed in your truck bed, so it allows for complete access to your truck bed when your hitch is removed. These four mounting holes, two on each rail, will sit flush with your truck bed, and they include these plastic cap plugs that are going to go into the holes in your truck bed to prevent dirt and grime from getting into them.
The brackets are vehicle-specific design, which reduces installation time and requires less drilling than your universal systems, and these brackets will mount to the outside of your truck's frame rails, drilling is required, and the crossmembers of these rails will sit along the top of the frame rails beneath the your truck bed and attached to these brackets. Now, all of these parts are made here in the USA of a sturdy steel construction with a black powder coat finish to help resist corrosion. And this kit includes everything that you see here on the table before me, you're gonna get the two rails, the mounting brackets and all of the installation hardware and the plugs, and a great set of instructions to walk you through the installation process. Well, that's gonna conclude our brief look today, I do hope that it was helpful for you. Again, my name is Andy, thank you for joining me.
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Kate F.
2/18/2026
Great pointer with the hoist Tanner, this thing is a beast! It is so awesome to not have to get out of the truck to be able to make those tight turns. Any big adventures coming up this year? Where are you going, what are you seeing?