The 2026 GMC Sierra 3500 HD offers a well-designed cabin that drivers in Collinsville will enjoy. With 44.5 inches of front legroom, there is plenty of space to stretch out during long drives. The truck comes with a 13.4-inch diagonal infotainment screen that includes Google built-in apps like navigation and voice assistance. Bluetooth streaming audio and SiriusXM keep you entertained on the road.
Seating options range from durable vinyl and cloth on base trims to premium leather and full-grain leather on the Denali and Denali Ultimate models. Higher trims offer front seats that heat and cool, heated rear seats, and a heated steering wheel. The Denali Ultimate even features 16-way power-adjustable seats with massage. Dual-zone automatic climate control is available to keep everyone at the right temperature. Browse our 2026 GMC Sierra 3500 HD inventory today.
Oklahoma truck buyers will also enjoy available features like the Bose premium 7-speaker sound system, power sunroof, and rear camera mirror. Visit Mark Allen Buick GMC at 15285 N. 137th E. Pl. to see the Sierra 3500 HD for yourself.