13.4 GMC Premium Infotainment System with Google Built-In | 15 Head-Up Display | Rear Camera Mirror | Bose 12-Speaker Audio | 16-Way Power Heated & Ventilated Front Seats | Power Sunroof | Power Retractable Assist Steps | GMC MultiPro Tailgate | Spray-On Bed Liner The 2026 GMC Sierra 2500 Heavy Duty AT4X Crew Cab combines extreme off-road capability with heavy-duty towing performance, presented in Onyx Black with an Obsidian Rush full-leather interior. The exterior showcases rugged AT4X styling equipped with animated LED projector headlamps, LED fog lamps, power-adjustable heated and auto-dimming trailer mirrors with integrated turn signals, power-retractable assist steps with LED perimeter lighting, a factory spray-on bed liner, a power sliding rear window, a power sunroof, Gooseneck/5th Wheel Prep Package, and a multi-function tailgate. Inside, the luxury-appointed cabin features 16-way power-adjustable front bucket seats with heating and ventilation, heated second-row outboard seats, a heated leather-wrapped steering wheel, driver memory settings, dual-zone automatic climate control, 120V AC power outlets in the instrument panel and cargo bed, a universal home remote, and all-weather floor liners. Technology is integrated throughout the cabin, anchored by a 13.4-inch diagonal GMC Premium Infotainment System with Google built-in, a 12.3-inch reconfigurable digital Driver Information Centre, a 15-inch diagonal Head-Up Display, a 12-speaker Bose Premium Series audio system, wireless Apple CarPlay and Android Auto, a wireless charging pad, a Rear Camera Mirror, Bed View Camera, an in-vehicle Trailering App, SiriusXM capability, and OnStar Basics (up to 8 years). Comprehensive safety and trailering technology comes standard with Sierra HD Pro Safety, including HD Surround Vision, Trailer Side Blind Zone Alert, Rear Cross Traffic Alert, Front and Rear Park Assist, Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Lane Departure Warning, Following Distance Indicator, IntelliBeam auto high beams, and the Driver Safety Alert Seat. Stock #T4379731 AMVIC LICENSED DEALER