"Experience the uncompromising capability of the 2021 GMC Sierra 1500 AT4. This rugged, off-road-ready truck is equipped with an EcoTec3 6.2L V8 engine, 10-speed automatic transmission, and 4-wheel drive to conquer any terrain. - SUNROOF, POWER - TECHNOLOGY PACKAGE: Includes HD Surround Vision, Rear Camera Mirror, Bed View Camera, and Multicolor 15"" Diagonal Head-Up Display - AT4 CARBONPRO EDITION: Unique grille surround, carbon fiber composite bed, and premium Bose sound system - DRIVER ALERT PACKAGE II: Forward Collision Alert, Lane Keep Assist, Automatic Emergency Braking, and more This Sierra AT4 delivers unparalleled capability, technology, and style. Experience the difference with a test drive today. The 2021 GMC Sierra 1500 AT4 - Engineered to Elevate Your Adventures."