2021 GMC Sierra 2500HD AT4 AT4 | One Owner | Trailer Brake Co...

2021 GMC Sierra 2500HD AT4 4WD Crew Cab – Duramax Diesel Power. Luxury Meets Muscle.Built to go beyond the pavement and rise to every challenge, this 2021 GMC Sierra 2500HD AT4 4WD Crew Cab is the ultimate blend of power, performance, and premium refinement. Equipped with the legendary 6.6L Duramax Turbo-Diesel V8 engine and paired with the 10-speed Allison® automatic transmission, this heavy-duty beast delivers jaw-dropping torque, massive towing capability, and reliable performance in the most demanding conditions. The AT4 trim is designed for those who live life off the beaten path, with a factory-installed 2" lift, off-road suspension, Rancho® shocks, skid plates, and an advanced 4WD system. With bold AT4 styling, black chrome accents, red recovery hooks, and 18-inch machined aluminum wheels with all-terrain tires, this truck turns heads while it tackles any terrain with ease. Inside, you’re treated to a fully loaded, premium cabin. This Sierra comes with heated and ventilated front bucket seats, a heated steering wheel, and remote start for comfort in any season. Enjoy dual-zone climate control, a power sunroof, and upscale Jet Black interior with Kalahari accents. The Crew Cab layout provides tons of passenger space, and smart storage keeps things organized on the go. Tech-wise, it’s all here: an 8" GMC Infotainment System with Apple CarPlay®, Android Auto™, Bluetooth, and available navigation, plus a Bose® premium audio system and a wireless charging pad. When it’s time to tow, this truck is ready—with an integrated trailer brake controller, trailer sway control, and GMC’s MultiPro™ Tailgate for unmatched functionality. Safety and visibility are top-notch, with features like HD Surround Vision, front and rear park assist, lane departure warning, and a rearview camera mirror. Whether you're towing, adventuring, or just riding in comfort, this 2021 Sierra 2500HD AT4 Diesel is the full package. Stop by and take it for a test drive—you won’t want to leave without it.