With few weeks ahead of the 2011 Detroit Auto Show, General Motors revealed today the GMC Sierra All Terrain HD Concept, a new car that previews the next-generation of heavy-duty trucks. Clearly inspired by the new 2011 Sierra HD, the All Terrain HD Concept features a unique five-foot, eight-inch Crew Cab/short box body configuration that supports a wheels-at-the-corners proportion.
The car is actually shorter than the production Sierra HD models and looks like a dedicated off-road performer. As you can see from the photos, the concept comes with enlarged fenders in order to cover the 35-inch-tall BFGoodrich tires, while the rear features lockable, lighted storage compartments, along with a number of tie-down cleats.
Some of the highlights of the concept include LED headlamps, taillamp and fog lamp lighting mounted in impact-resistant composite housings, LED park and turn signal lamps as well as LED floodlights for the cargo bed and assist steps. The design of the car is completed by the Iridium Metallic paint, a color that shows a reddish, anodized inflection when viewed from certain angles.
Under the hood, we find a new 6.6L Duramax turbo-diesel V8 engine mated to an Allison 1000 six-speed automatic transmission powertrain. Same combination is also offered in the 2011 Sierra HD trucks.
The engine delivers 397 horsepower (296 kW) and 765 lb.-ft. of torque (1,037 Nm). According to GM, the estimated payload capacity of the car is 2,700 pounds (1,225 kg). Estimated conventional towing capacity is 13,000 pounds (5,896 kg) while estimated fifth-wheel towing capacity is 15,600 pounds (7,076 kg).