California Vehicle Code
Sec. § 667


(a)

A utility trailer is a trailer or semitrailer used solely for the transportation of the users personal property, not in commerce, which does not exceed a gross weight of 10,000 pounds or a manufacturers gross vehicle weight rating of 10,000 pounds.

(b)

Notwithstanding subdivision (a), a utility trailer includes a trailer or semitrailer designed and used for the transportation of livestock, not in commerce, which does not exceed a gross weight of 10,000 pounds or a manufacturers gross vehicle weight rating of 10,000 pounds.
Source
Last accessed
Jun. 6, 2016