Cal. Veh. Code § 471

A “pickup truck” is a motor truck with a manufacturer’s gross vehicle weight rating of less than 11,500 pounds, an unladen weight of less than 8,001 pounds, and which is equipped with an open box-type bed not exceeding 9 feet in length. “Pickup truck” does not include a motor vehicle otherwise meeting the above definition, that is equipped with a bed-mounted storage compartment unit commonly called a “utility body.”