Inside, the concept gets the Denali's interior along with a new stereo headunit equipped with an 80gb hard drive. Instead of a traditional light bar, the Terrain has a line of LED lights across the top of the windshield. A pair of step rails on each side of the truck provide easier access to the cab and the sides of the truck bed. These are motorized, sliding into the body while not in use. The bed is equipped with a power outlet, compressed air outlet. LED lighting, and Ram Box-style compartments above the wheel wells.
The powertrain is less impressive: Despite using ram air scoops. the 6.6l Duramax Turbo Diesel engine retains its stock power output of 397 hp and 765 ft-lbs. torque. The engine is connected to the HD's existing six speed Allison transmission. However, the truck still has an impressive tow rating of 15,600 lbs.
Will the GMC Sierra All Terrain HD Concept make it to production?
Parts of the truck have been confirmed: The Iridium Metallic paint color will be offered exclusively on GMC models in a couple years, as will the dark anodized satin finish used for the concept's window trim. It's rumored that the styling will carry over to the next GMC 1500, which will reach the market as a 2013 model.
Although GM has yet to say whether the Sierra All Terrain HD Concept will see production, it seems like a no-brainer: Similar trucks have sold very well, and most of the truck could be built using off-the-shelf parts.
