You don't have to wait until the 2011 Detroit Auto Show for a closer look at the forthcoming GMC Sierra All-Terrain HD concept. That's because our friend Mike Levine and his PickupTrucks.com camera managed to get up close with the rugged rig, going on a guided tour with Lead Designer Carl Zipfel.
PickupTrucks.com was kind enough to shoot not one, but two videos while in the presence of the fingers-crossed-they-build-it concept truck. Hop the jump to view both of them.
Related GalleryGMC Sierra HD Concept
[Source: PickupTrucks.com]

