A heavy-duty pickup truck with an extended two-door cab and a long cargo bed, equipped with 4x4 drivetrain, chrome wheels, and a robust, utilitarian design.
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