A pickup truck’s length varies depending on its type and manufacturer, but according to GMC, a standard pickup is typically 17 feet long. Cabs and boxes are available in longer and shorter lengths.
The overall length of a GMC truck with a standard cab and a long bed is greater than 18 1/2 feet. A double cab truck with a normal bed is slightly longer than 19 feet. The length of a pickup with a larger crew cab and a standard box is around 20 feet. The total length is little over 19 feet if the truck has a crew cab and a short box, though.