This 2021 GMC Sierra 2500HD AT4 is a powerful and rugged pickup perfect for both work and adventure, with only 51,421 miles. Equipped with a robust 6.6L V8 Duramax Diesel engine, it delivers impressive towing capacity and performance. The AT4 trim offers off-road readiness with features like skid plates, hill descent control, and an off-road suspension, complemented by a bold exterior design and premium interior amenities. Well-maintained and ready to tackle any task, this Sierra 2500HD AT4 combines durability, capability, and comfort, making it an excellent choice for those seeking a reliable heavy-duty truck.Onyx Black Duramax 6.6L V8 Turbodiesel 10-Speed Automatic 4WD AT4