Extang Endure ALX Hard Folding Tonneau Cover (20-24 Sierra 3500 HD w/ 6.90-Foot Standard Box)

extang-endure-alx-tonneau-cover-rotary-latch
ROTARY LATCH
Unique among tri-fold covers, the ALX uses a simple "twist & lift" function to open and close the cover without the use of tailgate clamps.
extang-endure-alx-tonneau-cover-weather-resistant
WEATHER RESISTANT
Extruded side weather seals offer the ultimate all-weather protection to guard your gear from the elements.
extang-endure-alx-tonneau-cover-endurashield-panels
ENDURASHIELD PANELS
EnduraShield TPO-coated folding panels resist dents, scratches, and UV induced fading, and are capable of supporting up to 600 lbs. of evenly distributed weight.
extang-endure-alx-tonneau-cover-flush-mount-design
FLUSH-MOUNT DESIGN
The Endure ALX is a low-profile hard folding bed cover engineered to function like no other.
Durable yet lightweight aircraft-grade aluminum frame with stealthy EnduraCoat textured-black finish
Rugged ½-in. thick EnduraShield TPO panels resist impacts, abrasions, and UV exposure
Subtle, low-profile design sits flush with bed rails
Auto-latching Secure Rotary Release Latching System offers effortless operation
Up to 500-lb. weight capacity (evenly distributed)
Extruded side weather seals offer exceptional weather resistance
Offers ⅔ bed access with integrated buckle straps, or full bed access with integrated prop rods
Simple clamp-on installation
Limited 5-year warranty
From tireless engineering and the relentless pursuit of perfection comes a bed cover like no other—the Endure ALX from Extang and RealTruck®. With a flush-mounted design, EnduraShield construction, and effortless one-hand operation, the Endure ALX makes bed protection intuitive and easy.

The Endure ALX features four patented EnduraShield TPO panels—an automotive-grade polymer offering outstanding impact, abrasion, and UV resistance. Each ½-in.-thick panel is crafted with a robust aluminum frame for exceptional structural rigidity, enough to support 500 pounds of evenly distributed weight. The cover's alloy frame features a matte black EnduraCoat finish with textured black polymer hinge caps, blending seamlessly with its EnduraShield panels and factory bed rail caps.

The Extang Endure ALX is reinforced with extruded weatherproof seals at every seam to prevent moisture intrusion, protecting your valuable cargo from the elements.

At the tailgate, you’ll find Extang’s specially engineered Secure Rotary Latch System—an industry-first and Extang exclusive. The latch system’s intuitive design allows simple, one-handed operation with an effortless twist-and-lift motion. Closing the cover is just as easy, as the Secure Rotary Latch System automatically locks the cover when closed against the bed rails.

Opening the cover grants ⅔ bed access, secured using integrated nylon buckle straps to prevent excessive movement while driving. When maximum bed space is needed, the Endure ALX folds flat against the cab in seconds using its built-in prop rods.

Extang is a RealTruck brand. When you order the Endure ALX or any other Extang product from us, you’re dealing directly with the manufacturer. We proudly back each Endure ALX with a limited 5-year warranty.

Fitment:

• 2020 GMC Sierra 3500
• 2021 GMC Sierra 3500
• 2022 GMC Sierra 3500
• 2023 GMC Sierra 3500
• 2024 GMC Sierra 3500

Details

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov