Cal. Rev. & Tax. Code § 6023

“Mobile transportation equipment” includes equipment such as railroad cars and locomotives, buses, trucks (except “one-way rental trucks”), truck tractors, truck trailers, dollies, bogies, chassis, reusable cargo shipping containers, aircraft and ships, and tangible personal property which is or becomes a component part of such equipment. “Mobile transportation equipment” does not include passenger vehicles as defined in Section 465 of the Vehicle Code, trailers and baggage containers designed for hauling by passenger vehicles, or “one-way rental trucks” as defined and identified pursuant to Section 6024.