GMC Shows More of its Detroit-Bound Sierra All Terrain HD Concept

We first reported on the new GMC Sierra All Terrain HD Concept in mid-December, but since then, General Motors has released a slew of new photos. The updated gallery includes the first photos of the design study's interior that has been spruced up with higher quality and more luxurious materials than the standard Sierra, upon which it is based. Set to debut at next week's North American

GMC Previews Sierra All Terrain HD Concept Ahead of Detroit Show

General Motors will be presenting an ultra-tough concept study based on the four-door 2011 GMC Sierra HD pickup truck at the rapidly approaching Detroit Motor Show in mid-January. The GMC Sierra All Terrain HD study is highlighted by its rough n' tough exterior design and enhanced all-road capability. Shorter in overall length than production Sierra HD models, the concept boasts a unique