The 2026 GMC Sierra 3500 HD Chassis Cab offers a cabin built for hard work. Drivers in Wenatchee, WA will enjoy the standard 40/20/40 split-bench seats with covered armrest storage and lockable under-seat storage. The SLE trim features a 13.4-inch Premium GMC Infotainment System with a touchscreen, Bluetooth audio, and wireless phone projection. The Pro trim comes with a seven-inch touchscreen display that keeps you informed on every job.