Side Rail Kit for 21K Demco Hijacker to Fit UMS Underbed Kit on 2020 Chevy Silverado 2500
Question:
I found a great used 8550035 but I need 8550037. I dont have puck system. Can 8550035 be converted to use under bed rails in a 2020 2500 silverado
asked by: Tom R
Expert Reply:
Yes! To convert the 21K Demco Autoslide 5th Wheel Trailer Hitch w/ Slider # DM8550035 to the Hijacker # DM8550037 you just need the Side Plate Kit # DM6004. This is for the Demco UMS underbed system so in order to install this on your 2020 Chevy Silverado 2500 you need the Underbed Rail and Installation Kit # DR37FR.
This kit is similar to an OEM puck system for any truck but Demco has their own spacing for the mounting holes so you can only use Demco 5th wheel hitches that have the UMS side plat kites for this application.
Attached is a review video for you to check out.

Products Referenced in This Question
Replacement Side Plates for Demco Autoslide 5th Wheel Trailer Hitches - Underbed Mount
- Accessories and Parts
- 5th Wheel Hitch
- Plates
- Side Plates
- Autoslide
- Demco
more information >
Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 21,000 lbs
- 5th Wheel Hitch
- Sliding Fifth Wheel
- Above Bed Rails
- 5250 lbs Vertical Load
- 21000 lbs GTW
- Double Pivot
- Premium - Single-Hook Jaw
- 15-1/4 - 18 Inch Tall
- 14 Inch Fore/Aft Travel
- Demco
more information >
Underbed Rail and Installation Kit for Demco UMS 5th Wheel and Gooseneck Trailer Hitches
- 5th Wheel Hitch Rails
- Custom
- Below the Bed
- Demco
more information >
Product Page this Question was Asked From
Demco Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Underbed - 21,000 lbs
- 5th Wheel Hitch
- Sliding Fifth Wheel
- Aftermarket Below Bed Rails
- 5250 lbs Vertical Load
- 21000 lbs GTW
- Double Pivot
- Premium - Single-Hook Jaw
- 15-1/2 - 18-1/4 Inch Tall
- 14 Inch Fore/Aft Travel
- Demco
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: Pullrite Adapter Rails Needed For GM's Towing Prep Package
- Q&A: Comparing The Demco Autoslide And PullRite SuperGlide 5th Wheel Hitches
- Q&A: Is The Demco Autoslide 5th Wheel Hitch # DM89GV Okay For a 2024 Ram 3500 Short Bed Factory Pucks?
- Q&A: Which Torklift Campers are a Fit for 2022 Ford F-350 Long Bed with OEM Hitch
- Q&A: Can Gen-Y Pin Box Be Used with Demco Hijacker Autoslide 5th Wheel Hitch
- Q&A: Will Demco Hijacker Autoslide 5th Wheel Hitch Work with Gen-Y Hitch Shock Absorbing Pin Box
- Q&A: Recommended Camper Tie-Downs For A 2021 Ford F-350 Crew Cab With An 8' Bed
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Article: Choosing the Right Suspension Kit for Your Truck and Trailer
- Article: 5th Wheel Hitch Installation | The Ultimate DIY Guide
- Article: The Basics: Firestone Air-Spring Kits
- Article: Timbren Suspension Enhancement Systems
- Article: Gooseneck to 5th Wheel Adapters
- Article: Best Air Bag Suspension (2023)