GMC Logo2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box: Open long box pickup truck bed with cargo bag.

Open long box pickup truck bed with cargo bag.

Open extended cab long box pickup truck bed with visible truck tailgate, internal bed liner, and a red and black cargo bag inside.

View Dimensions of the 2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box

View 30 images of the 2011 GMC Sierra 3500HD III (GMT900, facelift 2011) Extended Cab Long Box

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