Used 2021 GMC Sierra 3500HD AT4

The 2021 GMC Sierra 3500HD AT4 is a rugged, heavy-duty truck designed for both work and off-road adventure. Equipped with a 6.6L V8 Duramax diesel engine, it offers impressive towing capabilities, making it a great choice for those who need both power and versatility. The AT4 trim adds an off-road-ready suspension, a unique front grille, and skid plates, as well as advanced tech features like an 8-inch touchscreen and available safety options. Inside, the cabin is spacious and refined, with premium materials and plenty of comfort features for long drives. Whether you're hauling heavy loads or exploring tough terrain, the Sierra 3500HD AT4 is built to handle it all.