There's a simple way to measure truck beds. Use a measuring tape to measure the distance between the inside of the bulkhead and the inside of the tailgate to get the length of the truck bed. Then measure the widest part of the truck bed from point to point to get the width.

Separating the cab (front portion) of the truck from the bed (cargo) portion, which is roughly the middle of the truck's wheelbase, allows the bed to move independently of the cab, so frame twists to accommodate tough terrain or a heavy load does not bend or tear bodywork.

For the most part, there are usually three different bed sizes for pickup trucks: short, standard and long. Pickup truck beds, sometimes called boxes, are available in a few different lengths, depending on the truck. For the most part, there are usually three different bed sizes for pickup trucks: Short.