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This hitch is designed for serious towing with a 21,000-lb gross towing weight and a 4,000-lb vertical load limit. The solid steel construction and black powder coat finish give it the strength and durability needed for long hauls with big campers or toy haulers. It mounts using an underbed kit, keeping the setup sturdy while leaving the bed clean when you’re not towing.
When you’re backing into tight campsites or navigating narrow spots, the manual slider gives you 14" of fore/aft travel so your short-bed truck has the clearance it needs to turn safely. That extra space prevents the trailer from hitting the cab during sharp, slow-speed maneuvers. It’s an easy manual operation that gives peace of mind when space gets tight.
The premium single-hook jaw wraps fully around the king pin for 360-degree contact, giving a snug, secure connection that cuts down on rattle compared to slide-bar jaws. A 3/4" thick solid steel locking bar reinforces that link once you’re coupled. Combined with cushioning polyurethane bumpers that absorb road shock and reduce noise, the result is a quieter, smoother ride mile after mile.
The double-pivot head makes it easier to line up and couple since it moves both front to back and side to side. Once connected, the spring-loaded handle with its comfort grip and tethered safety pin makes coupling straightforward—no fighting with stiff levers or noisy releases. The mechanism automatically locks when the jaw closes so you know you’re ready to roll without extra steps.
With height options at 18-3/8", 19-5/8", and 20-7/8", this hitch lets you fine-tune your setup for a level trailer and proper bed rail clearance. Those settings make it easier to match different pin box styles or trailer heights while keeping your rig balanced and towing smoothly on every trip.
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

Lazer S.
4/28/2026
Sorry to hear that, Robert. Can I ask why your mechanic is saying these frame brackets are incorrect for your 2024 Silverado 2500? I checked with Demco and they are a fit for your truck. If it's because the instructions say 2020 on them, that is just due to them not being updated because the install is the same for newer trucks as well. If this is the reason your mechanic is saying they are wrong, he is costing you money and I would really find a different mechanic to do the install.

Heather A.
5/26/2026
Thanks for the feedback, we’d like to take a closer look with you to make sure everything is set up correctly. On a 2026 Silverado, the truck height can vary depending on configuration, so a few details will really help us narrow this down. When you have a moment, could you let us know what trailer make and model you’re towing, and whether it’s sitting nose-high or nose-low when connected? Also, do you know which hitch height position you’re currently using on the Demco Recon 5th Wheel Hitch w/ Slider (top, middle, or bottom setting), and whether you’re using the factory puck system on your Silverado? Once we have that information, we can help confirm whether this is an adjustment issue or if another setup change is needed to get everything sitting level.




Gwendolyn Y.
5/21/2025
5th wheel looks great in your truck, Paul! What kind of trailer are you hauling?

Victoria H.
3/18/2025
Thanks Patrick! I appreciate you taking the time to share your valuable insight. It looks like you're ready to roll. Do you have any trips planned yet?

Harvey
3/3/2020
This Demco 21K fifth wheel hitch is a great piece of equipment. I have pulled my 40 Heartland Bighorn fifth wheel as far north and west as Wisconsin and south and east as Florida. It has performed like I thought it should and beyond. I am sure glad that I chose the Recon over any of the more expensive brands. Its a real performer and it looks pretty cool too!

Kevin
11/20/2023
Pretty good. Still rotating a little. I tightened the main bolt to the ball more than the 30lbs. It’s not rotating as much as it has been. Still haven’t figured out if or where I would drill a hole for a bolt to go in. I’m not really wanting to do that yet.

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Steve B.
10/1/2024
Absolutely great.