"CONVENIENCE PACKAGE, DRIVER ALERT PACKAGE I, AT4 PREFERRED PACKAGE, MULTIPRO AUDIO SYSTEM BY KICKER, BOSE PREMIUM 7-SPEAKER AUDIO SYSTEM, POWER REAR SLIDING WINDOW, WIRELESS CHARGING, UNIVERSAL HOME REMOTE, FRONT AND REAR PARK ASSIST, LANE CHANGE ALERT, REAR CROSS TRAFFIC ALERT, HEATED SECOND ROW OUTBOARD SEATS, 18"" MACHINED ALUMINUM WHEELS, LT275/65R18C GOODYEAR WRANGLER DURATRAC TIRES AND MORE! CLEAN CARFAX! The 2021 GMC Sierra 1500 AT4 Crew Cab Short Bed is a rugged and capable off-road truck that combines serious off-road performance with premium comfort and modern technology. Inside the spacious crew cab, perforated leather-appointed seating surfaces and heated front bucket seats with power adjustment provide excellent comfort. The heated leather-wrapped steering wheel, power sliding rear window, and available heated second row seats enhance comfort for all passengers. On the exterior, the Sierra AT4 makes a bold statement with its 18-inch machined aluminum wheels wrapped in LT275/65R18C Goodyear Wrangler Duratrac all-terrain tires, black grille, body-colored bumpers with black accents, and off-road suspension with 2-inch factory lift. The MultiPro tailgate, spray-on bedliner, and red recovery hooks further highlight its serious off-road capability. Every drive is confident and connected thanks to the premium audio system, dual-zone automatic climate control, adaptive cruise control, front and rear park assist, lane change alert with side blind zone alert, and rear cross traffic alert. With 4WD, a locking rear differential, hill descent control, and advanced trailering features, this well-equipped 2021 GMC Sierra 1500 AT4 delivers the perfect blend of off-road prowess, technology, and everyday usability."