GMC Sierra 3500 HD Tonneau Cover - Undercover - Flex - Black Textured - `20-`26
GMC Sierra 3500 HD Tonneau Cover - Undercover - Flex - Black Textured - `20-`26
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GMC Sierra 3500 HD Tonneau Cover – UnderCover Flex, Black Textured (2020–2026). A tri-fold hard cover built for daily use with a low-profile fit inside the bed rails.
FRP composite panels are lighter and more dent resistant than aluminum; Flex folds in thirds for quick access and locks for cargo security. Prop rods let you drive with it fully open, while rubber seals and drain tubes route water from the bed. Clamp-on, no-drill install; the whole cover removes without tools. Backed by a 3-year manufacturer warranty.
Features
- FRP composite tri-fold panels
- Ultra-low profile inside bed rails
- Full-bed access with prop rods
- Clamp-on, no-drill installation
- Rubber seals and drain tubes
Questions? Call our team in Austin, TX at 512-982-9393 or the Los Angeles, CA area at 562-981-6800. We provide installation and customization at both locations.
Considering multiple items? Contact us for shipping discounts. We install on premises at both locations.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Need Assistance?
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Call us at 512-982-9393 (Austin, TX) or
562-981-6800 (Signal Hill, CA)
and get assistance from one of our sales team members!
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