2026 GMC Sierra 2500HD AT4 4WDKey Features:- Duramax 6.6L V8 Turbodiesel with 10-Speed Automatic & 4WD- AT4 Preferred Package with X31 Off-Road Package- Gooseneck/5th Wheel Prep Package- Heated & Ventilated Front Seats with Heated Rear Seats & Heated Steering WheelThis premium 2026 GMC Sierra 2500HD AT4 is built for serious work while delivering the comfort and refinement expected from a top-tier heavy-duty truck. Powered by the legendary Duramax 6.6L V8 turbodiesel paired with a 10-speed automatic transmission and capable 4WD, it delivers the power and confidence needed for demanding jobs and towing. Equipped with the AT4 Preferred Package and X31 Off-Road Package, this Sierra features an off-road-tuned suspension, 2-speed active transfer case, Hill Descent Control, and off-road capability designed to handle challenging terrain. The Gooseneck/5th Wheel Prep Package adds serious towing versatility, while the premium cabin features heated and ventilated front seats with 10-way power adjustment, heated rear outboard seats, heated steering wheel, Bose Premium 7-speaker audio, wireless phone projection, Apple CarPlay, Android Auto, and SiriusXM 360L. Advanced camera and safety technology includes HD Surround Vision, Bed View Camera, Trailer Camera Provisions, Ultrasonic Front and Rear Park Assist, Rear Cross Traffic Alert, and Trailer Side Blind Zone Alert. Finished with 20" High Gloss Black aluminum wheels, a spray-on bedliner with GMC logo, LED cargo lighting, and smoked amber roof marker lamps, this Sierra 2500HD AT4 combines rugged styling, premium comfort, serious towing capability, and off-road performance in one impressive package. A fresh oil change has been completed and this truck is ready for delivery.