This truck is built for where the road ends!Some trucks look the part. The 2026 GMC Sierra 1500 AT4 with the 6.2L V8 actually plays it. Under the hood sits one of the most capable engines in the full-size pickup segment — a naturally aspirated 6.2-liter V8 that delivers 420 horsepower and 460 lb-ft of torque. Whether you're hauling a loaded trailer up a mountain pass or powering through the Willow on a Saturday morning, this engine answers every demand with confidence and authority.The AT4 trim was designed from the ground up for drivers who don't let terrain dictate their plans. A factory-lifted suspension, Rancho shocks, skid plates, and an off-road-tuned MultiPro tailgate make the Sierra AT4 ready the moment the pavement disappears. Pro Grade Protection adds underbody shielding where it matters most, while the 10-speed automatic transmission keeps power flowing smoothly whether you're crawling over boulders or merging onto the highway.Inside, the Sierra AT4 refuses to make you choose between ruggedness and refinement. Heated and ventilated leather-appointed front seats, a 13.4-inch diagonal Google-built infotainment display bring genuine luxury to every mile. Dark metallic accents and AT4-exclusive badging give the cabin a purposeful, premium feel that matches the truck's muscular exterior.With a maximum towing capacity of up to 13,200 lbs and a payload rating that means business, the Sierra 1500 AT4 6.2L doesn't just look like a workhorse — it outperforms like one. This is a truck for those who demand more: more power, more capability, more confidence on every surface, in every condition, every single day.