Cal. Rev. & Tax. Code § 6092.5
(a) Every qualified person making any sale of a mobilehome or commercial coach required to be registered annually under the Health and Safety Code, or of a vehicle required to be registered under the Vehicle Code or subject to identification under Division 16.5 (commencing with Section 38000) of the Vehicle Code, or a vehicle that qualifies under the permanent trailer identification plate program pursuant to subdivision (a) of Section 5014.1 of the Vehicle Code, or of any salvage certificate vehicle as defined in Section 11515 of the Vehicle Code, is presumed to be making a sale at retail and not a sale for resale. The presumption may be rebutted by taking a resale certificate from any of the following:
(c)