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 International Auto Show, GMC says the concept model is an exploration of heavy-duty truck capability combined with greater off-road versatility. Even if the Sierra All Terrain HD Concept doesn't make it as is onto the road, chances are that it will inspire a future production version. Full HD gallery after the break.