To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Backing into tight campsites or making sharp turns is much easier with the automatic slider that gives you 14" of travel front to back. As the truck turns, the rack-and-pinion system moves the hitch head smoothly toward the tailgate so the trailer clears the cab—no need to pull a lever or stop to release anything. When you straighten out, it slides back on its own for towing. It’s smooth, controlled motion every time, giving you more room where it matters most.
The wraparound, single-piece jaw completely surrounds the king pin for full 360-degree contact. Combined with a 3/4" solid steel locking bar, that design gives a tight, rattle-free hookup that feels solid even over rough roads. You’re not just latched—you’re locked in with no side play or clanking, so towing feels stable and quiet mile after mile.
A sturdy steel build and rust-resistant black powder coat give this hitch the backbone to handle 21,000 lbs gross towing weight and 5,250 lbs vertical load. The double-pivot head helps smooth out bumps and dips so you feel less jarring through the truck and trailer. With three height settings—15-1/2", 16-3/4", and 18-1/4"—it’s easy to dial in a level setup that keeps your rig steady on the road.
The included custom underbed mounting kit keeps your truck bed clear when the hitch is out. The hitch comes pre-assembled—just bolt on the side plates, set your height, drop it into the four receivers, and lock it down with safety pins. When you’re done towing, pull the pins and lift it out for full bed space. The diamond-plate tread on the base adds grip while giving it a clean, finished look that fits right in with a heavy-duty setup.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello, everybody. This is Jeff at etrailer.com. Today, we're gonna take a look at this underbed rail and installation kit for the Demco Hijacker UMS 5th wheel and gooseneck trailer hitches. Now, this is a custom fit part. It is designed to fit the 2020 and newer Chevrolet Silverado and GMC Sierra 2500 and 3500 HD trucks without the OEM prep package. And on a custom fit part like this, I do like to recommend for you to go to our website, use the fit guide, put in your year and model vehicle, and it'll show if this will work for your application.
Now, many trucks now are coming equipped with the factory installed underbed puck systems in the truck bed to allow you to install a 5th wheel hitch for towing and then easily remove the hitch when you're not towing. Now, if you do not have one of those already installed in your truck bed, this kit will let you have that same underbed mount system for your Demco Hijacker 5th wheel and gooseneck trailer hitches. Wanna pop up an insert. There's the Demco hitch. It'll fit right into this.
Now, the advantage with this underbed mount system is when you're not towing your 5th wheel, you can remove that hitch from your truck bed and still have full access to your truck bed. There's no rails to get in the way. This installation kit is designed for use with the Demco Hijacker underbed series 5th wheel and gooseneck trailer hitches. These underbed rails right here will provide complete access to the truck bed when the hitch is removed. The rails are not exposed.
They're all underneath the bed. And it'll just give you four small mounting holes that'll sit flush with the truck bed. As we mentioned, this is a vehicle specific design, so it does reduce the installation time and requires less drilling than universal systems. Basically, these brackets right here on the sides, these will bolt onto the outside of your truck's frame rails. These crossmembers will sit along the top of the frame rails beneath the bed.
Now, drilling is required for installation. These parts are a steel construction. They have a nice, black powder coat finish to resist corrosion. Now, this does include everything shown here. The frame mounting brackets, the crossmembers, all the installation hardware, even gives you a couple tubes of threadlockers to put on the bolts when you go to install it. And it even comes with four of these cap plugs that you'll insert into the holes in your truck bed to keep those holes protected from any dirt getting into them. Comes with a nice set of instructions that'll describe how this all goes together. But that should do it for the review on the underbed rail and installation kit for the Demco Hijacker UMS 5th wheel and gooseneck trailer hitches..
Ratings & Reviews
Part arrived on time complete. Item matched the description.
Good product. Easy install. Would give it five stars except you DO HAVE TO DRILL holes in your frame. That was a little disappointing. Other than that great product.
Great functional hitch. Poor powdercoating though (mostly flaking off) with quite a bit of rust after only a year.
Well packed, the delivery was faster than I anticipated. I should have my new truck in a couple of days so I can complete the mounting.
great hitch for my customers new truck to pull his new Durango 5th wheel!
Fast Delivery as well
Always RV
Mesa Az
Hitch sucks pain in the assembly to connect and disconnect.
Hitch looks great and functions great as well. Installation could’ve been smoother due to the installation instruction measurements being slightly off. Look at finding hole caps that are 3” instead of two and drilling the larger hole.
Company and all personnel were awesome to work with .. I guess the install kit with bolts and instructions got ripped out of cardboard box.. the hitch came freight with no issues .. I like the hitch and product so far … I did receive the bolts and install kit a week later .. still did not have instructions with it .. but can get those online I think .. overall please so far with the experience thx
Hitch works great. Had some issues using it when I first got it with putting the pin to lock down the handle but its worked much better lately. The hitch is heavy so I leave it in the back of the truck. Wish I could remove it so it doesn't get weathered.
I had an old hitch kit in my older truck. The truck company changed the design of my new truck. I called etrailer sales and they gave me the part number for the updated kit. They knew of the change and had the design in stock. They shipped the new one right off. In fact I got it sooner then I needed it as it was in the middle of the winter. All the parts were there and it went in nicely and work great.
After a year, I still like my Demco autoslide. It works great. I have pulled my trailer quite a few times and have had no issues at all. I know quite a few people that pull 5th wheels and one actually went out and purchased a autoslide after watching mine work.
I think etrailer can't find the correct frame brackets for my 2024 chevy 2500hd. As the most recent order is NOT CORRECT and my c.c. has roughly 3k on it and still no Remco 18k autoslide installed yet!!!??
UPS delivery damaged first delivery and returned it to sender.
I contacted E Trailer and they immediately sent a replacement. I received it sooner than expected.
Excellent customer service.
Item was a Demco DR37FR under frame 5th wheel hitch mount installation kit.
Instructions left alittle to interpretation when it came to hitch height in the bed of the truck. For a f350 super duty it is the medium set up. Save you some time and effort. Other then that it looks great and will be testing it out this weekend.
This hitch has been used daily since i purchased it. I deliver fifth wheel travel trailers all over the country. This hitch has worked flawlessly from day one. This hitch is one of the only products that I've ever bought that is exactly what it was described to be. Im not one to do reviews, so the fact that im doing this one , in itself, says a lot about the quality of your product. The design and looks are much better than any other hitch ive seen. It just looks better in the truck bed than others do.
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