The 2025 GMC Sierra 2500HD AT4 is a rugged and capable heavy-duty pickup that's ready to take on any challenge. Featuring the powerful Duramax 6.6L V8 Turbodiesel engine paired with a 10-speed automatic transmission, this Sierra 2500HD AT4 delivers exceptional performance and towing capacity.- ASSIST STEPS, POWER RETRACTABLE, BLACK- ALTERNATOR, 220 AMP- 6.6L V8 Diesel Turbocharged (Duramax) (B20-Diesel Compatible)- AT4 PREMIUM PLUS PACKAGE- GOOSENECK / 5TH WHEEL PREP PACKAGEThis Sierra 2500HD AT4 is loaded with premium features that elevate the driving experience, including a Bose premium sound system, SiriusXM with 360L, steering wheel audio controls, and a 120-volt power outlet in the bed. The interior is outfitted with luxurious touches like heated and ventilated front seats, a heated steering wheel, and a multicolor head-up display.For added capability and confidence on the road, this Sierra 2500HD AT4 is equipped with the X31 Off-Road Package, providing features like hill descent control, an off-road high clearance step, and spray-on bedliner. The advanced trailering technology, including a bed view camera and trailer side blind zone alert, make towing a breeze.Safety and convenience are prioritized with features like wireless charging, wireless phone projection, rear cross-traffic alert, and a surround-view camera system. The Sierra 2500HD AT4 also offers the latest driver-assist technologies, such as forward collision alert, automatic emergency braking, and lane departure warning.With its rugged good looks, exceptional capability, and premium amenities, the 2025 GMC Sierra 2500HD AT4 is the ultimate heavy-duty pickup for those who demand the best. Experience the power and refinement of this remarkable vehicle today.