This 2025 GMC Sierra 2500HD AT4 delivers commanding capability with its legendary Duramax 6.6L V8 Turbodiesel engine paired to a smooth 10-speed automatic transmission. Built on the AT4 platform with 4WD and the X31 Off-Road Package, this crew cab is engineered for serious work and adventure. With just over 15,400 miles, this white crew cab standard bed combines premium comfort and advanced technology in a package designed to handle anything you demand.- Duramax 6.6L V8 Turbodiesel with Turbo- 2-Speed Active Transfer Case with Off-Road Suspension- Bose Premium 7-Speaker Sound System with SiriusXM- Heated & Ventilated Front Seats with 10-Way Power Adjustment- Spray-On Pickup Bedliner with GMC Logo- Bed View Camera with Trailer Camera Provisions- HD Surround Vision with Ultrasonic Park Assist- Wireless Phone Projection and Wireless Charging- Heated Steering Wheel and Remote Vehicle Starter- 120-Volt Power Outlets (Bed & Instrument Panel)The AT4 trim elevates this Sierra with premium Jet Black leather appointed seating accented with Kalahari details, creating an upscale cab environment. Safety technology is comprehensive—featuring automatic emergency braking, lane departure warning, trailer side blind zone alert, and rear cross traffic alert. Convenience features including push button start, keyless entry, heated second-row outboard seats, and integrated trailer viewing software make this truck as practical as it is capable. Contact us today to experience this formidable Sierra 2500HD and discover why discerning truck buyers choose the AT4 platform for their hardest-working days.