What is Overall Height of Demco Rail Kit Adapter 6333 in Bed of 2026 GMC Sierra 2500
Updated 12/23/2025 | Published 12/20/2025
Question:
Demco 6333 for 2026 GMC truck. What is the measurement from underside of unit to top of rail? What is the measurement between truck bed floor and underside of unit?
asked by: Michael
Expert Reply:
Hey Michael, the overall height of the Demco Rail Kit Adapter part # DM6333 from the top of your 2026 GMC Sierra 2500 bed is 2 inches. Once installed the bottom of the rails this kit provides will sit a little higher than flush with the corrugation in your truck bed as the bed does not support this rail kit. The small gap would allow for a bed liner if that's what you're asking about. See attached photo.
(click to enlarge)
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Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21K
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- 5th Wheel Hitch Rails
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Handy B.
12/23/2025
Looks like from top of rail to bed of truck is 2-1/2” I have a picture of this but couldn’t paste in.