Official Word:

The 2018 GMC Sierra 2500HD All Mountain concept, a one-of-a-kind snow-climbing machine, will debut this week at Vail Mountain. The Sierra All Mountain concept takes GMC's signature bold design and engineering excellence to new heights, adding tank-like tracks that help it navigate rugged, snow-covered terrain. Built on a GMC Sierra 2500HD Denali 4WD Crew Cab platform, the epitome of GMC's strength and design, the All Mountain concept stands ready to tackle steep slopes and extreme weather...Read.