To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
This hitch is built from sturdy steel and rated for 21,000 lbs gross towing weight and 4,000 lbs vertical load. It’s the kind of setup that holds steady when you’re pulling big fifth wheels across long stretches. The solid construction and rust-resistant black powder coat finish give it the strength to handle heavy use while keeping the connection tight and secure every mile.
The wraparound, single-piece jaw gives full 360-degree contact around the king pin for a secure, rattle-free fit. A 3/4" thick solid steel locking bar reinforces that hold and automatically locks when the jaw closes. That means less chucking, less noise, and a more confident hookup every time you back in to connect.
When space gets tight during slow-speed turns or backing into a spot, the manual slider gives you 14" of front-to-back travel to help keep your cab clear. It’s designed to give short-bed trucks the turning room they need without the stress of worrying about trailer contact during sharp angles.
The double-pivot head moves front to back and side to side, helping the hitch line up easily with the trailer while reducing strain on both ends. Polyurethane bumpers help absorb road shock and cut down on noise for a smoother towing feel. It all works together to limit chucking so rides stay quiet and controlled.
Getting your trailer level is simple thanks to three hitch height settings—18-3/8", 19-5/8", and 20-7/8". These adjustments let you dial in bed rail clearance and balance your load just right. The spring-loaded handle with comfort grip makes coupling simple, while the tethered safety pin keeps it secured whether open or closed.
Alternate Instructions
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Male 1: Today on this 2015 Ford F-350, we'll be having a look at and showing you how to install the Demco under bed rail and installation kit for Demco Hijacker fifth wheel and gooseneck trailer hitches, part number DM8551000. Here's what a Demco under bed system looks like installed. These under bed rails allow us to have all of the mounting solutions for our fifth wheel and gooseneck trailers underneath the bed of our truck. This will allow us to maintain full access to our truck bed and not lose any of the valuable space in it. One of the great features about the Demco under bed system is how easy it is to remove our fifth wheel to gain full truck bed access. So I'll show you how to do that now.We'll pull our clips, pull our pins out, move our handles to the unlocked position.
We'll do this on both sides. Now with an extra set of hands we can grab the slider, pull it out. Now, you'll see once our fifth wheels out of our truck bed, we have complete access to our entire bed of our truck. There is nothing that sticks up above it at all since it's all underneath. It does come with these plugs that you can install in the holes that you drilled in your bed to help keep dirt and debris out of the rails.These under bed rails will allow you to tow a fifth wheel trailer or a gooseneck trailer with the right adapter.
Comparing these two other fifth wheel or gooseneck options, what's really nice about this is being completely under the bed yet there's nothing that sticks up. It does provide a very clean look in your truck when you aren't towing your trailer, and you want to have full bed access. Now that we've gone over some features, we'll show you how to get them installed.To begin our install, we've measured according to the instructions to find the four locations that we need to drill our pilot holes in our bed. When taking these measurements, it's critical that we take the initial measurement from the end of the bed and not the end of our tailgate. If you have a plastic drop-in bed liner, you want to make sure you move it before you make your initial pilot holes.
You can always reinstall it before you put the rails back in and drill up from underneath the bed to enlarge the plastic bed liner if you want to. So we'll have a pilot hole near where the factory dimple is for the factory under bed puck system. So make sure we don't drill into that temple, but we drill where you measured.Now, with our pilot holes made at all four corners, we can now enlarge it to the appropriate size using a hole saw. We'll continue doing the same process for all four holes. Now to help prevent rust on our truck, we're going to take some clear coat and go along the inside edge.
If you have a spray in bed liner, you can just use flat black spray paint as well because that will match your bed liner.Now, we find ourselves in our wheel well. We need to insert our rail over the frame underneath the bed. We'll start with our rear rail first. Make sure the holes are facing up. We'll slide this in position right here. We go all the way across, and then we'll start to slide it back. We'll slide this back over the rear set of holes. We have lined up pretty good on the driver's side, but we need to get it further back on the passenger side. So we may need to use a hammer to tap it into place.Now, we can do our front rail. We'll insert it in the same manner. Now, we'll slide it back and show what's underneath or holes. We've already went ahead and took our fifth wheel or slider, we're using a slider in this case, dropped it in place into our bed, down in our rails, and secured to our rails. We have insured where the legs of our slider go through the bed of the truck into rails that all four are centered into our hole in the bed of our truck.Now, we'll bolt our frame brackets to our rails. To do that, we'll use a half inch bolt with lock washer and a flat Washer. Now for the back hole on our frame bracket on the driver's side, we'll insert a half-inch diameter bolt through that hole into the frame. It will be capped on the inside of the frame with a flat washer and a lock nut. Both the front and the rear hole on the passenger side bracket are the exact same way as this. For our center hole here, we'll take a three-quarter inch diameter bolt, we'll go through that and into the frame. On the inside, we'll cap it with a nut. Now, we'll take our pull wire, we'll go through our forward attachment hole. It'll come about our frame, and we can just pull it around back towards us like this. And we'll thread on our knurled bolt, and we can pull that through the frame. We'll move the pull wire, and we're thread on our flange nut.Now, we can go repeat the same process for the passenger side. The only difference being we won't have a knurled bolt on the front on the passenger side. We'll have a standard bolt like this with a washer on the inside and the nylon lock nut.Now we can start to tighten down our hardware that secures our frame bracket to the frame. Now, we'll do the other ones. Now that we have our frame brackets tightened to the frame on the truck, we'll now tighten the rails to our frame bracket. Now, we'll torque all of our hardware to the amount specified in the instructions.And that completes our look at and showing you how to install the Demco under bed rail and installation kit for Demco Hijacker fifth wheel and gooseneck trailer hitches, part number DM8551000 on this 2015 Ford F-350.
Ratings & Reviews
Same as one
Was easy to install with very few tools.
Great product, drill 4 holes and you are done, simple.
Excellent product, it is fairly easy to install.
It’s a pleasure doing business with your company and getting products in a timely manner.
Easy to install.
Hitch appears to be well-constructed and sturdy. I have not yet installed it. Some assembly is required, and the instructions aren't crystal clear. Better illustrations would be helpful. The videos online are the best source of installation information. Shipping materials lack protection. The powder coating was damaged in a few locations, as well as the instructions. I expect the hitch will operate exactly as designed a long as I protect the exposed parts from the inevitable elements. Rubber grommets would be a nice addition to the holes drilled in the truck bed.
Timely delivery. Product was very well packaged. All parts where clearly marked and instructions are well writen.
Just as described. Install was very easy.it had one base rail missing and called and talked to Sheila and she sent another one out. Had to set up our camper for a new job we are starting and needed the part in two days. She overnighted it and it was here on time.
Rod
nice product fit was good. prompt shipping.
Arrived on time and in good condition. Instructions were good a bit hard to install on drivers side. But that’s the truck not the part. Part had no issues with fit
Not to difficult to install. It will require 2 people to get the bolts torqued down. Handles a 14000 lb fifth wheel with ease
Great design. Installation wasn't bad at all (plan on buying a carbide drill bit). Hole plugs just cheap plastic.
Only issue I ran into with my truck is that using the supplied measurements the back holes hit 1/4 on the bed rail. Still large enough to install the cross bars and hitch but something to be aware of. Truck was a 2006 F250 lariat 2wd with 6.5 box
Installed the kit on my 08 ford f350 srw crewcab diesel. Fit fine. Well made. I just think the passengers side center bolt washer/extension piece was welded on the wrong side. I did a backyard fix , buy cutting a small filler piece out of steel so the frame plate wouldn't suck up to the frame and bend. Otherwise, good strong steel
worked perfect.no drilling! well worth buying this instead of the universal kit. and no rails in the bed!
Perfect fit. Planned ahead and had put on an Airlift 5000 with the auto level system. Adding this under bed mount for my hijacker auto slide on my 2015 F250 was simple and bolted right up with my airbags.
etrailer customer service was great in helping me make sure all the parts I ordered won’t play nice together.
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.
The under bed mount for the demco auto slide was easy to install with easy instructions and works great
Good quality hitch, light weight, easy to slide . Got about 1500 miles pulling 17000lb trailer with no problems
The fit was perfect. No holes to drill. Very happy with the product and service.
The under bed rail kit was easy to install. It provides easy removal and installation of the Demco Autoslide 5th wheel hitch. I could not be more pleased with the Demco products. I recommend getting the Demco 5th Wheel Lifting Bracket
Item # DM6100. It makes removal and installation of the hitch a breeze.
Great product , easy to understand instructions, and a perfect fit. Customer service was also top notch had a problem with the first order missing rail fell out of the box in transit , no fault on etrailer, they sent me a new order before the old one was picked up! Fantastic customer service, I will definitely order from etrailer again!
Do you have a question about this 5th Wheel Hitch?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.