2011 Detroit: GMC Sierra All-Terrain HD Concept is an off-roading monster
One of the many cars revealed by the General at the 2011 North American Auto Show was the GMC Sierra
Read MoreOne of the many cars revealed by the General at the 2011 North American Auto Show was the GMC Sierra
Read MoreAt the 2011 Detroit Auto Show next month, General Motors will unveil the 2011 GMC Sierra All Terrain HD Concept,
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