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Replace the side plate assemblies that came with your Demco Autoslide above-bed fifth-wheel trailer hitch (DM8550040, DM8550034 or DM8550035). Bolts onto the hitch base so that you can attach your hitch to your universal above-bed rails.
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Jeff Hello, everybody. This is Jeff at etrailer.com. Today, we're gonna take a look at the replacement side plates for the Demco Hijacker Autoslide above bed mount fifth wheel trailer hitches. Now these will replace the side plates that came standard on your Demco Hijacker Autoslide above bed fifth wheel trailer hitches. It is designed to fit the Demco 13,000 pound, part number D-M-8-5-5-0-0-4-0 model. Fits the 18,000 model, part number D-M-8-5-5-0-0-3-4.
And it also fits the Demco 21,000 pound model, D-M-8-5-5-0-0-3-5. All three of those models we do sell separately on our website. Now when these side plates are attached to your Autoslide assembly it'll allow you to install your fifth wheel hitch in to your universal above bed base rails. These are a simple bolt on installation tier hitch base. You can see it does have multiple rows of bolt holes.
And the reason they do that is it let's you adjust your hitch height that you need for your application. It'll give you three different hitch height settings. Either 15 1/4 inches, 16 1/2 inches, or 18 inches. And the hitch height is critical because you wanna be able when you're towing your fifth wheel to be as level as possible. And the hitch height is always measured from the bottom of the truck bed to the top of the hitch head.
Now the finish on these, they have a nice rust resistant black powder coat finish on them. It is a steel construction. Does include everything shown here. Includes all the mounting hardware. All the pins and clips that'll attach it to your base rails.
And the nice set of instructions that'll describe how these install. And how it operates. But that should do it for your review on the replacement side plates for the Demco Hijacker Autoslide above bed mount fifth wheel trailer hitches..
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
Ratings & Reviews
Jeff
1/1/2026
As with all parts from this manufacturer, still working great and great customer service ????
Gwendolyn Y.
2/13/2025
Hey Charles. I'm happy that Kelly got you all fixed up with the right plates! What kind of 5th wheel are you towing?
Kate F.
2/2/2026
Hey Butch, sorry Demco did not include them with the parts. I am going to send you a separate email with the instructions attached. I see this was your first order with us, I hate that you had to wait a little longer to get them. In future, please know that we have real people here in Wentzville, MO ready to take your call. That way we can get you what you need a little quicker in the future. Welcome to etrailer, I am happy you found us =)
Do you have a question about this Accessories and Part?
Condition: Surface Scratches
Notes: Item has minor cosmetic scratches.
Condition: Installed
Notes: Item has been previously test fitted and has cosmetic install marks.
Condition: Surface Scratches
Notes: Item has minor cosmetic scratches.
Info for this part was:
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Mike L.
3/16/2026
You're very welcome Daryn. I'm glad we could help!