2015 GMC Sierra HD All Terrain is a 4-wheel-drive off-road-inspired vehicle. It has exclusive design and muscular on-road presence. It will be offered on 2500HD and 3500HD double cab and crew cab models, in SLE and SLT trims. In addition, the company is also making an available package for the vehicle – the Z71 Off Road, which includes Rancho twin-tube shocks, hill descent control and a skid plate. Sierra HD is driven by the 6.0L gas engine which comes as a standard. There is an optional Duramax turbo-diesel unit.
The exterior of 2015 GMC Sierra HD All Terrain includes as no-cost-option chrome surround on the grille, exterior graphics, aluminum underbody shields and 8-inch six-spoke chrome cast-aluminum wheels. There are available 20-inch chrome aluminum wheels on the 2500HD.