2007 GMC Sierra 3500HD III (GMT900) Extended Cab Long Box: Rear view of dual rear wheel extended cab long box pickup.

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Rear view of heavy-duty pickup truck with extended cab and long box configuration, prominent dual rear wheels for enhanced load capacity, tailgate handle, and visible exhaust pipe.

View Dimensions of the 2007 GMC Sierra 3500HD III (GMT900) Extended Cab Long Box

View 28 images of the 2007 GMC Sierra 3500HD III (GMT900) Extended Cab Long Box