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.