Up-close with the GMC Sierra All Terrain HD concept
 

Before we went on a brief hiatus before the end of the year we talked briefly about the new concept pickup from GMC, the Sierra All Terrain HD. Well fortunately the gents over at PickupTrucks.com somehow got to spend some time with this new concept truck, and its lead designer Carl Zipfel, before its public [...]http://feedads.g.doubleclick.net/~a/...HLLaf5s9Q/0/di
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