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Detroit 2011: GMC Sierra All Terrain HD Concept (video)

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With several world premieres and unveilings, the Detroit Auto Show gave us the opportunity to take a look at the the GMC Sierra All Terrain HD Concept.

The super sized truck will be the Ford SVT Raptor's closest competitor and comes equipped with the new 6.6-litre Duramax Diesel engine producing 397 horsepower and 765 pound-feet of torque mated to an Allison 1000 six-speed automatic transmission.

Check out our team's video and learn more about this American monster!