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This hitch is rated for a 21,000 lbs gross towing weight and 5,250 lbs vertical load limit, giving it the backbone needed for heavy fifth-wheel campers. The sturdy steel construction and rust-resistant black powder coat finish provide long-term durability for serious towing. It’s a solid, no-flex connection that stays stable mile after mile.
The automatic slider moves up to 14" fore and aft whenever you make a turn, giving you the clearance needed for tight corners without leaving the cab. The built-in rack-and-pinion gear design delivers smooth, controlled movement every time you steer past 10-15 degrees. It’s the kind of smart mechanical motion that makes backing into campsites or navigating small parking areas simple.
The wraparound, single-piece jaw completely encloses the king pin with full 360-degree contact for a tight, secure fit. A solid 3/4" thick steel locking bar reinforces the connection and automatically locks when coupled. Together they cut down on chucking and rattling, making towing quieter and more controlled on rough roads or long hauls.
The double-pivot head moves front to back and side to side to ease hookup and absorb bumps while towing. Three polyurethane dampeners cushion those movements to reduce noise and vibration. You get a steadier, quieter tow that feels more relaxed on the road.
The included underbed installation kit keeps the bed rail-free when the hitch is removed. The pre-assembled base drops into four receivers and locks with simple handle turns secured by safety pins. When it’s time to haul something else, just unlock the feet and lift it out for full truck bed 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.
Today we're going to take a look at the replacement side plates for the Demco Hijacker Autoslide fifth wheel trailer hitches, and this is for the underbed mount. Now this will replace the side plates that came standard with your Demco Hijacker Autoslide underbed fifth wheel trailer hitch. They are designed to bolt onto your hitch base so that you can attach your hitch to the custom underbed rails. This is designed to fit the 13,000 pound Hijacker, Part Number DM8550041. It also fits the 18,000 pound Hijacker, DM8550022, and the 21,000 pound Hijacker, DM8550037 models. This is a simple bolt-on installation to your hitch base. There are multiple rows of bolt holes on these side plates and on your hitch base, so depending how you line them out, it will let you adjust the hitch height.
The hitch height settings will go from either 15-1/2 inches to 16-3/4 and 18-1/4, so you have your choice of those three settings to get your trailer and tow vehicle as level as possible. These do have a rust-resistant black powder coat finish. They are an all-steel construction. It does include the instructions. It will include the mounting hardware, and it also includes two 1/4-inch spacers and two 3/8-inch spacers, and the spacers are used for adjusting your hitch mount with the bed pockets of your truck, and this part is made in the U.S.A. The way that these would open up is you just pull the clip, pull the pin out, and you can see each one of these will rotate out, and when you rotate those out, it will let you drop it into your underbed mount, and then once there, you just turn this back in to lock it, and then put your clip right through there just like that. This part is made in the U.S.A. That should do it for the review of the replacement side plates for Demco Hijacker Autoslide fifth wheel trailer hitches with the underbed mount..
Ratings & Reviews
Mike L.
5/1/2026
Glad to hear that William, thanks for the photo!
Bob N.
10/14/2025
A year later….. So I took the camper out 5 times this summer. Had zero issues with the hitch. Unhooking was a little tricky for me. I would raise the camper, pull the latch on the hitch, go to pull the truck away….only for the latch to lock in again. This happened to me several times but I blame myself for lack of experience. This has become less of an issue the more I unhook from the camper. Overall I’m happy with the hitch and would recommend.
Andrew
8/27/2025
It has worked great so far so good however wave expresshorizon transport does not accept this manufacturer’s hitch. I pull a 12,800 something pound fifth wheel camper loaded has done great no issues. Here’s hoping it last 20 years.
Kate F.
8/27/2025
Gwendolyn Y.
5/28/2025
You deserve a major high-five for installing this monster by yourself! That's a big feat to take on! I'm happy that everything smoothed out in the end and that you are enjoying the hitch! What kind of camping trips are lined up so far for the summer?
Doug
6/17/2026
Denco Autoslide 5th wheel hitch is working perfectly a year later. Weve traveled extensively across the USA and Canada over year, the hitch has performed as expected each time. One key, keep the hitch and king pin clean and well lubricated.
Lazer S.
2/10/2026
Glad you are liking it, Steve! I'll let Demco know about the instructions as well. Definitely don't want to get those mixed up so it should be as clear as possible. What kind of 5th wheel are you going to be towing?
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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?