Experience heavy-duty power and luxury with this Summit White 2020 GMC Sierra 3500HD AT4 Crew Cab 4x4. Equipped with the legendary Duramax 6.6L Turbo Diesel V8 engine and Allison 10-speed automatic transmission, this truck is ready for the toughest jobs and the longest hauls. The AT4 trim adds off-road tuned suspension, hill descent assist, and a rear locking differential for superior capability. Inside, enjoy leather-trimmed upholstery, heated and ventilated front seats, a heated steering wheel, and advanced connectivity with Apple CarPlay, Android Auto, and a 8" GMC Infotainment System. The Technology and AT4 Premium Packages bring features like a Rear Camera Mirror, Bed View Camera, and power sunroof. Stay safe and confident with Driver Alert Packages I & II, trailer brake controller, towing mirrors, and a spray-on bed liner. This Sierra is built for work, play, and everything in between. Ready to tow, haul, and impress—schedule your test drive today!