Recommended Parts to Mount a Demco AutoSlide in a 2018 GMC 3500 w/ Puck System
Updated 12/22/2025 | Published 10/04/2024
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Question:
Looking to verify what I need for a 2018 GMC 3500 8 bed to use and demco auto slide. slide 6107, prep rails 6206, with side rails 6003?
asked by: Brad S
Expert Reply:
Hey Brad! That's an interesting list of parts and I would be happy to help you. If your 2018 GMC Sierra 3500 has the OEM puck system you will need the Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package item # DM6206.
There's no side plates for the 2016-2019 GM puck system so the Replacement Side Plates for Demco Autoslide 5th Wheel Trailer Hitches item # DM6003 and the Replacement Head and Base Assembly for Demco Autoslide 5th Wheel Trailer Hitches item # DM6107 are both compatible and what you'll need.
Those two parts combined will give you the Demco Autoslide 5th Wheel Trailer Hitch w/ Slider item # DM8550035.
Product Page this Question was Asked From
Replacement Side Plates for Demco Autoslide 5th Wheel Trailer Hitch - Chevrolet/GMC
- Accessories and Parts
- 5th Wheel Hitch
- Plates
- Side Plates
- Autoslide
- Demco
more information >
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Jerred H.
12/22/2025
Hey Brad, how did things turn out with the Demco Autoslide setup on your GMC 3500? Did the rail adapter and side plates fit together the way you needed? Your update could make it easier for the next person working on a similar towing setup.