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If you’ve ever worried about clearance while backing into a tight campsite, the automatic sliding action on this hitch makes it effortless. The built-in rack-and-pinion gears give you 14" of smooth travel front to back, so the head shifts toward the tailgate when turning and back toward the cab when straightening out. You don’t have to climb out to release a handle or set a lever—it does the work for you, letting you keep your focus on maneuvering safely.

When you’re towing heavy, a confident hookup matters. The wraparound, single-piece jaw gives you full 360-degree contact around the king pin, and a 3/4" solid steel locking bar reinforces the connection. That tight fit cuts down on rattle and movement compared to slide-bar jaws, so the trailer feels locked in and steady no matter how far you travel. Once coupled, the jaw automatically locks into place, adding an extra layer of security without extra steps.

The double-pivot head moves front to back and side to side to match your trailer’s motion, which keeps things feeling calm even on rougher roads. Three polyurethane dampeners cushion those movements and help absorb shock, keeping noise low and chucking to a minimum. The hitch head naturally pivots into position as you back up to couple, taking the guesswork out of lining up under load.
When it’s time to use your truck bed again, this hitch lifts out cleanly thanks to its rail-free underbed design. The custom mounting kit uses four receivers in the bed—just unlock the handles, pull the safety pins, and lift it out. With no exposed rails left behind, you’re free to load up whatever else you need once towing season wraps up.
Matching your trailer height is simple with three hitch height settings built into the side plates. You can raise or lower the head to get a level setup and proper bed rail clearance for your pin box. It’s a small tweak that makes a big difference in how balanced your rig feels rolling down the highway.

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

Thomas S.
2/7/2019
THE BEST FUNCTIONAL SHORT BED 5th WHEEL HITCH OUT THERE BUT ALSO THE HEAVIEST AND THE MOST DIFFICULT TO REMOVE AND REINSTALL. I HAD TO TAKE IT TO A GARAGE TO REMOVE IT AND AGAIN TO REINSTALL IT. I JUST LEAVE IT IN THE TRUCK BED NOW RATHER THAN FIGHT WITH IT.

Andy
3/15/2022
The Demco hijacker 18 K I think is the best hedge out there by far three different height settings and the auto slider part of it is awesome haven’t had an issue at all
Do you have a question about this 5th Wheel Hitch?
Condition: Installed
Notes: Item has been previousy test fitted and has minor cosmetic install marks as well as some scratches.
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Buddy R.
3/24/2019
good happy with the whole set up.had a small issue that demco remedied swiftly.only other thing is the finish does not seam to last.it is covered when not in use and it chips and rust,s easily