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39Pics Aplenty: GMC Sierra All Terrain HD Concept is ready to play dirty

GMC Sierra All Terrain HD concept – Click above for high-res image gallery

31Video: PickupTrucks.com gets a closer look at the GMC Sierra All-Terrain HD concept

PickupTrucks.com checks out the GMC Sierra All-Terrain HD concept– Click above to watch video after the jump

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