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gm truck challenge

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    GM Silverado/Sierra pickups challenge the competition - Video added     1181333100

    Click the photo for a gallery of high-res shots from the GM Truck ChallengeTo mark the availability General Motors' latest heavy-duty GMT900 full-size trucks, the automaker invited us out to its Milford Proving Ground to drive its big trucks along with all of the competition. GM had a variety of ...

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