GMC Logo2007 GMC Sierra 2500HD III (GMT900) Regular Cab Long Box: Side view of a heavy-duty pickup with long box and dual rear wheels

Side view of a heavy-duty pickup with long box and dual rear wheels

Profile shot of a large pickup truck emphasizing its extended long cargo box and dual rear wheels for enhanced payload and stability.

View Dimensions of the 2007 GMC Sierra 2500HD III (GMT900) Regular Cab Long Box

View 38 images of the 2007 GMC Sierra 2500HD III (GMT900) Regular Cab Long Box

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