2025 GMC Sierra 2500HD AT4 Summit White 4WD Duramax 6.6L V8 Turbodiesel Recent Arrival! Clean CARFAX. 6.6L V8 diesel turbo engine with 10-speed automatic transmission and four-wheel drive. Gooseneck / 5th-wheel prep package for a gooseneck or 5th-wheel hitch. ProGrade trailering system with hitch guidance, hitch view, and an in-vehicle trailering app. Tow hitch, exhaust brake, and tow hooks for hauling and towing. Adaptive cruise control, front collision warning, and front collision mitigation. Cross-traffic alert, lane departure warning, and rear parking aid. Backup camera and aerial view display system. Heated front seats, heated rear seats, and cooled front seats. Premium sound system with satellite radio and steering wheel audio controls. Running boards and an integrated tailgate step. Heated power-folding side mirrors with integrated turn signals. Rain-sensing wipers, automatic high beams, fog lamps, and daytime running lights. Dual-zone automatic climate control with rear defrost. Keyless entry, push-button start, and remote engine start. Power driver and front passenger seats with adjustable lumbar support. Mirror memory, seat memory, and an auto-dimming rearview mirror. Front and rear all-terrain tires with aluminum wheels. WiFi hotspot, telematics, and power windows. Security system, stability control, and traction control. Rear 60/40 folding bench seat with storage.