Meet the 2026 GMC Sierra 2500HD AT4, a powerful diesel pickup engineered for those who demand serious capability and premium comfort in one capable package.- Duramax 6.6L V8 Turbodiesel engine with 10-speed automatic transmission and 4WD- AT4 Preferred Package with premium styling and capability enhancements- X31 Off-Road Package featuring off-road suspension and 2-speed active transfer case- Gooseneck/5th Wheel Prep Package for serious towing applications- Bose Premium 7-Speaker Sound System with SiriusXM 360L trial subscription- Wireless Phone Projection and Apple CarPlay/Android Auto compatibility- HD Surround Vision with Bed View Camera and trailer camera provisions- Spray-on Pickup Bedliner with GMC Logo protecting your investment- Heated and ventilated leather front seats with 10-way power adjustment- Wireless Charging and dual USB charging ports throughout the cabin- Remote Vehicle Starter System and Push Button Start for convenience- Off-Road Suspension with Hill Descent Control for challenging terrain- Rear Cross Traffic Alert and Trailer Side Blind Zone Alert for safety awareness- Fresh Oil Change completed—ready to work or playThis Sierra 2500HD arrives with just 11,560 miles, showcasing the meticulous attention to detail GMC brings to heavy-duty hauling. The stunning Black exterior is complemented by gloss black header grille details and LED smoked amber roof marker lamps that command attention on any road. Inside, the premium cabin features perforated leather-appointed front seat trim with heated outboard seats on both rows, creating a refined environment that doesn't compromise on durability.The Duramax diesel powerplant represents serious capability for towing, hauling, and everyday driving demands. Paired with the responsive 10-speed automatic transmission, this truck delivers the torque and control you need for gooseneck trailers, heavy fifth wheels, or demanding work. The 2-speed active transfer case and off-road suspension mean you can confidently handle rough terrain when the job calls for it.Technology integration throughout the cabin keeps you connected and in command. The premium GMC infotainment system works seamlessly with Apple CarPlay and Android Auto, while wireless phone projection eliminates cable clutter. The Bed View Camera with trailer viewing software gives you precise perspectives during hookup and backing operations. SiriusXM 360L trial subscription keeps entertainment and information at your fingertips during long hauls.Safety and awareness come standard with features like Automatic Emergency Braking, Forward Collision Alert, and Front Pedestrian Braking. The HD Surround Vision and Rear Cross Traffic Alert provide comprehensive visibility, while Trailer Side Blind Zone Alert adds an extra layer of protection when towing. Ultrasonic front and rear park assist makes maneuvering this capable truck effortless in tight spaces.This is a truck built for the serious operator who refuses to compromise. Visit our showroom to see why the Sierra 2500HD AT4 stands as the choice for those who demand both capability and refinement.