Description A squashed version of the production model, the Sierra All Terrain HD Concept is shorter, wider and taller than the GMC Sierra pickup truck it is based on. The concept comes with some heavy-duty amenities such as custom control arms, Fox off-road shocks, front/rear jounce shocks, automatic locking differentials and a front stabilizer bar with electric disconnection. The massive grille, fender flares and 20-inch aluminum wheels fitted with 35-inch BFGoodrich KM2 tires help provide for a beefier look too.
