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This hitch is rated for 21,000 lbs gross towing weight and a 4,000 lbs vertical load limit, giving you the strength you need for serious 5th-wheel towing. The sturdy steel construction and rust-resistant black powder coat finish help it stay solid and reliable over the long haul. It’s a setup that feels secure and steady every time you back in and pull out onto the road.
For short-bed trucks, making sharp turns can be a real worry. The manual slider gives you 14" of front-to-back travel, creating the clearance needed for slow, tight turns without your trailer getting too close to the cab. It’s designed so turning and parking in tight spaces feels controlled instead of stressful.
The wraparound, single-piece jaw provides 360-degree king pin contact for a secure, snug connection. A 3/4" thick solid steel locking bar reinforces that link once it’s coupled, cutting down on movement and noise compared to slide-bar jaws. The result is a firm, stable connection that tows quietly mile after mile.
The double-pivot head moves both front to back and side to side so it can follow the trailer naturally over uneven roads. Polyurethane bumpers cushion the motion and absorb road shock, helping reduce chucking between the truck and trailer. Every bump feels more controlled, keeping both you and your gear comfortable on long trips.
Getting level is easier thanks to three hitch height settings at 18-3/8", 19-5/8", and 20-7/8". You can dial in the fit for your specific setup without extra fuss. The spring-loaded handle with comfort grip makes coupling straightforward, while the tethered safety pin keeps it locked securely during travel.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi there Silverado owners. Today on our 2018 Chevrolet Silverado 2500 we're going to be installing Demco's Underbed Rail Installation Kit for the Demco Hijacker 5th Wheel or Gooseneck. If have a gooseneck trailer, the underbed rail kit will also work with Demco's Hijacker Gooseneck Hitches. This underbed rail kit is going to allow you to install a Demco 5th wheel or a gooseneck hitch on your Silverado.With your new 5th wheel or gooseneck hitch installed you can haul that toy hauler, or 5th wheel trailer that you've been wanting to haul, or you can go ahead and put it to work out at the job site. The rails will work with any Demco Hijacker 5th wheel or gooseneck hitch. You'll want to make sure you pick the appropriate hitch for your needs.One of the things that I really like about this kit is that it installs underneath your bed so when you take your 5th wheel or gooseneck out you have a nice clean look.
Unlike raised rails that will stick up above your bed.I also like how easy it is to install. You use the existing holes in your frame so there's no drilling required, which really cuts down on the install time and the amount of fatigue you're going to have putting it in.Another thing I really like about this kit is that it'll allow you to use the Demco Hijacker 5th wheel, which works out great for tighter turns than you'll get with other ones. Especially if you have a short bed truck due to it's auto slide feature.We'll begin our installation in the bed of our truck by marking out the locations where we're going to drill to install our underbed rails. These measurements are going to vary depending on the length of the bed of your truck so you'll want to closely look at those measurements and mark it out like we've got here. You'll find specific measurements for your truck in your instructions.Well now I need to drill four holes using a two-inch hole saw.
We're going to do it at each corner where we marked. You can see this in the diagram in your instructions. We'll now repeat that for the three remaining holes. With all of our holes drilled out we can clean up the metal shavings now. Then we'll use some clear coat to prevent any rust and corrosion around our exposed metal where we drilled.
You can use some general purpose cleaner to clean off any of the markings that you made when determining where your hole location should be.Now that we've completed all the cutting we need to do in the bed, we can begin mounting our underbed rails. We're going to start with the side rails that are going to mount onto our frame here. Your rails are going to be labeled. We're on the passenger side. We've grabbed our passenger side side rail here.
We'll be using four of the longer bolts that come in your kit with hex heads. We'll then prepare these by placing lock washers and flat washers on them. We'll have four like this, for each side, prepared to install the rail onto the side of the frame by setting it on there and matching up the holes that's already existing in your frame, with the holes on our side rail. You'll see it's already got weld nuts in it. You simply take your bolt, slide it through and thread it into the frame. We're going to do this with the remaining three holes that have weld nuts. We'll repeat this on the other side.For our third holes that don't have weld nuts, we'll use the fish wire provided in the kit. We're going to go through the hole until it comes out the other side of the frame. You might have to finagle it around to get it through the other side. Then on the other side of your frame, we're going to slide a spacer over our fish wire. Then thread one of the carriage bolts, that come in the kit, onto the fish wire. First you'll feed in your spacer, then your bolt, then we'll just pull them through till it comes out the other side. Once you've got it pulled through, we'll place a nut on this side. We're going to repeat this with the other hole on this side and the two on the other side.You'll receive blue Loctite in your kit. You want to make sure you put some of that on all of your bolts.Next we'll be sliding our cross rails from one side of the frame across to the other but in order to get them to fit you are going to have to cut out a small section here. You don't need to cut it completely out. We're actually just going to cut it straight up. We're just going to go up like this. We're going to just be doing this around the section where you see the slits in your side rail. You want to make sure it's wide enough to fit your cross rail in. It's about three and a half inches. If you cut it there you could check to see if it'll fit. You may need to notch the sheet metal here at the bottom as well, in order to get it to fit.Now if it does get tight when pushing it in, you may need to loosen the bolts to your truck bed to get the extra clearance or if it's really close, like ours is, you could just take a piece of wood or a rubber mallet and tap it in. We're going to do the exact same process for our front rail. With both of our rails in place we can take the hardware that comes in our kit. We're going to be using the shorter large diameter hex head bolts with a flat washer on it. This is going to slide up through our slide rail. We're going to place a spacer plate underneath the rail. This has got to go through the front most hole, through the side rail, through your spacer plate and then into your cross rail. On the top we're going to place a nut. We're going to repeat that for the three remaining holes for both of your cross rails.We'll now tighten down all of our hardware using a one-inch socket. You may need a one-inch wrench to hold the nuts on some of them. Before you torque everything down, it's not a bad idea to take your 5th wheel, set it onto your base rails, to make sure that it's going to line up properly. If everything then you can go back and torque all the hardware to the specifications found in your instructions. If your 5th wheel doesn't fit you may need to loosen the hardware and slightly shift the rails until it lines up. Now with your rails torqued down you can install your Demco 5th wheel or gooseneck and hit the road.That completes our installation of Demco's Underbed Rail Installation Kit for the Demco Hijacker 5th Wheel and Gooseneck on your 2018 Chevrolet Silverado.
Ratings & Reviews

Sierra K.
8/23/2021
That is because this product only fits vehicles without The OEM Prep Package. You want something like this: Item # DM6194.

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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Kirk C.
7/26/2020
The under bed kit is the best. Having the truck bed useful when not traveling is great. I use a small electric hoist and casters for lifting and moving so the weigh is no problem. Installation was a little on the difficult side but any experienced DIYer can handle it.