GMC/Chevrolet 2500 & 3500 6'10 Standard Bed

American Aluminum for the American Heavy-Duty Standard

The GMC Sierra 2500HD and Chevy Silverado 2500HD and 3500HD with the 6'10" Standard Bed are the working core of the GM heavy-duty lineup. These trucks pull fifth wheels, carry work equipment, and put serious miles on in demanding conditions. Thunder Armor's hard aluminum tonneau cover is precision-fit for the 2020-2026 Sierra and Silverado 2500HD/3500HD 6'10" Standard Bed, engineered by Thunderstone Manufacturing to deliver commercial-grade protection, security, and best-in-class low-profile style.

Thunder Armor Features & Benefits

• Made in America: Proudly designed, engineered, sourced, and manufactured in the United States. True American craftsmanship in every detail.

• Heavy-Duty: Made from premium-grade aluminum, built to last and provide years of reliable protection against the toughest conditions.

• Best-in-Class Low-Profile Design: Engineered for a precision fit, Thunder Armor achieves a best-in-class low-profile design that sits virtually flush with your truck bed.

• Enhanced Theft Protection: Durable aluminum construction and secure latch design provide reliable defense against theft and unauthorized access.

• Weather Resistance: Keep your cargo dry and safe from rain, snow, and extreme temperatures with our robust all-weather design.

• Rear View Visibility: A clean, flush look that maintains rear window visibility and maximizes your truck bed's usable space.

• Quick & Easy Installation: Install your tonneau cover in just 30 minutes. Minimal tools required.

• Instant Availability: In stock and ready to ship today.

What's Included

• Thunder Armor hard aluminum tonneau cover (GM 2500/3500 6'10" Standard Bed specific)

• Heavy-duty no-drill clamp hardware

• Weatherproof perimeter seal

• Integrated latch mechanism

• Installation hardware and instructions

The Thunderstone Manufacturing Standard

Thunder Armor tonneau covers are engineered and manufactured by Thunderstone Manufacturing, a division of Timpte, Inc., a trusted name in trailer manufacturing for over 140 years. Known for building the #1 selling dry-bulk commodity trailer in North America, Timpte brings decades of proven engineering, durability, and American craftsmanship into every Thunder Armor product. This heritage ensures our tonneau covers deliver the same level of strength, reliability, and performance customers have come to expect from the Timpte name.

Why GM HD Owners Choose Thunder Armor

Enhanced theft protection for a truck that carries serious cargo. GM 2500HD and 3500HD beds routinely carry tools and equipment worth tens of thousands. Thunder Armor's secure latch design and durable aluminum construction provide reliable defense against theft and unauthorized access.

All-weather protection in every working condition. Whether it's a job site in January or a farm lot in July, Thunder Armor keeps your cargo dry and safe from rain, snow, and extreme temperatures with its robust all-weather design.

Heavy-duty aluminum for a heavy-duty application. Thunderstone Manufacturing builds Thunder Armor from premium-grade aluminum. The heavy-duty construction matches the demands of a platform rated to haul commercial loads.

No-drill on a truck with a long commercial service life. HD trucks stay in service for a decade or more in commercial applications. Thunder Armor's no-drill installation means the bed rail is unmodified for the entire service life of the truck.

Full installation guide →