GM is back to the off-roading domain with the all new GMC Sierra All Terrain HD ($TBA). This baby has better suspension and you can opt for upgrades too, a higher ground clearance, and wider stance than the typical Sierra. Its powered by a massive 6.6L Duramax diesel V8 pumping out 397 hp and 765 pound-feet of torque, rugged tires, and built-in cargo boxes on the sides of the bed.
