New 2026 GMC Sierra 3500 HD AT4 For Sale Warrenton, VA

Introducing the 2026 GMC Sierra 3500HD AT4, a premium heavy-duty truck engineered to handle demanding work and deliver commanding capability on any terrain.- 6.6L Duramax V8 Turbodiesel engine with 470 hp and 975 lb-ft of torque- Duramax B20-Diesel compatible with engine block heater- 10-Speed Automatic transmission with 4WD- Gooseneck/5th Wheel Prep Package for professional-grade hauling- X31 Off-Road Package with hill descent control and off-road suspension- 2-Speed Active Transfer Case for enhanced terrain management- Bose Premium 7-Speaker Sound System with SiriusXM 360L- Premium GMC Infotainment System with 13.4 diagonal display- HD Surround Vision with bed view camera and trailer provisions- Perforated leather front seats with heating and ventilation- Heated rear outboard seats with split-folding capability- Wireless charging and wireless phone projection- 10-Way power driver and passenger seat adjusters with lumbar support- Power sunroof with deep-tinted glass- 20 high-gloss black aluminum wheels with all-weather floor linersThis Sierra 3500HD arrives in a sophisticated gray exterior that commands presence while maintaining versatility. The AT4 designation signals serious capability, backed by an off-road suspension system and all-terrain prowess designed for both professional applications and weekend adventures.The interior reflects premium craftsmanship with perforated leather trim and dual front bucket seats. Heated and ventilated seating surfaces accommodate all passengers, while the heated steering wheel and dual-zone automatic climate control ensure comfort in any condition. The 10-way power adjustable seats with lumbar support provide customized positioning for long drives and work days.Technology integration is seamless throughout the cabin. The 13.4-inch information display serves as the hub for the Premium GMC Infotainment System, while wireless phone projection and charging keep devices powered and connected. SiriusXM 360L brings premium entertainment, and the Bose audio system delivers exceptional clarity.Safety and visibility are engineered into every system. HD Surround Vision, automatic emergency braking, lane departure warning, and rear cross-traffic alert work together to protect you and your cargo. The bed view camera with trailer provisions supports precise maneuvering, whether hitching a gooseneck or managing complex job sites.The truck's work-ready features serve professional needs without compromise. The Gooseneck/5th Wheel Prep Package, combined with trailer tire pressure monitoring and hitch guidance technology, transforms this vehicle into a professional hauling platform. The spray-on bedliner with GMC logo protects your investment while maintaining that signature AT4 aesthetic.This 2026 Sierra 3500HD AT4 represents the intersection of diesel power, premium comfort, and genuine off-road capability. Contact us to experience the commanding presence and capable engineering that define this truck.