When your truck needs to pull double duty as both a workhorse and a daily driver, the 2026 GMC Sierra 3500HD AT4 steps up without compromise. Whether you're hauling equipment to the jobsite, towing the RV for a weekend getaway, or heading into the mountains with a trailer in tow, this Sierra is designed to make heavy-duty capability feel effortless. Under the hood, the legendary Duramax® 6.6L V8 Turbo-Diesel paired with a 10-speed automatic transmission delivers the kind of confidence that makes every trip feel a little easier.The AT4 trim brings a premium edge to GMC's toughest truck lineup. Inside, you'll find heated and ventilated front seats, heated rear outboard seating, a 13.4-inch GMC Premium Infotainment System with Google Built-In, Bose® premium audio, and a 15-inch Head-Up Display that keeps important information right in your line of sight. Add in the Power Sunroof, Rear Camera Mirror, and HD Surround Vision, and you've got a truck that's as enjoyable on a long road trip as it is capable on the job.Finished in Summit White with the Black Badging Package, black 20-inch wheels, red recovery hooks, and signature AT4 styling, this Sierra has a commanding presence from every angle. It's built for the realities of life in the Kootenays—whether that means towing, exploring, working, or a little bit of everything. Come see why this Sierra 3500HD AT4 is a local favourite.Key Features:? Duramax® 6.6L V8 Turbo-Diesel & 10-Speed Automatic ? AT4 Premium Plus Package with Head-Up Display ? Power Sunroof & Rear Camera Mirror ? Bose® Premium Audio & 13.4" GMC Infotainment System ? Gooseneck/5th Wheel Prep Package & GMC MultiPro Tailgate