When capability is non-negotiable, the 2026 GMC Sierra 3500HD AT4 Crew Cab delivers the strength you need with the refinement you want. Designed for drivers who tow, haul, explore, and spend plenty of time behind the wheel, this Sierra HD combines Duramax® 6.6L V8 Turbo Diesel power, advanced trailering technology, and premium AT4 features into one impressive package.From job sites to weekend escapes, the Sierra 3500HD AT4 is equipped to handle whatever the day brings with 4WD capability, off-road suspension, skid plates, 20" all-terrain tires, and a Gooseneck/5th Wheel Prep Package. Inside, you'll find a comfortable and connected cabin featuring heated and ventilated front seats, heated second-row seating, a Bose® premium audio system, and a 13.4" GMC infotainment system with Google built-in—perfect for longer drives through the Kootenays or towing adventures beyond Trail.Smart towing technology makes every trip easier with features like HD Surround Vision, Bed View Camera, Rear Camera Mirror, Hitch Guidance, Trailer Brake Controller, and Trailer Side Blind Zone Alert. Add in the convenience of the GMC MultiPro™ Tailgate, spray-on bedliner, power-retractable assist steps, and premium AT4 styling, and this Sierra HD is ready for work, recreation, and everything in between. Stop by Champion Chevrolet in Trail and see what sets this Sierra 3500HD AT4 apart.Key Features:? Duramax® 6.6L Turbo Diesel with 10-speed automatic transmission? AT4 off-road capability with 4WD, skid plates & all-terrain tires? Gooseneck/5th wheel prep with advanced trailering technology? Premium cabin with heated & ventilated seats and Bose® audio? GMC MultiPro™ Tailgate with spray-on bedliner & bed power outlet