California Code, Health and Safety Code - HSC § 18084.7

Manufactured homes, mobilehomes, and commercial coaches shall not be subject to registration or titling under this part or to Part 13 (commencing with Section 5800) of Division 1 of the Revenue and Taxation Code prior to the original registration of the manufactured home, mobilehome, or commercial coach. Upon original registration and issuance of title, whether in the name of a consumer, a dealership, or some other party, the manufactured home, mobilehome, or commercial coach thereafter is subject to all registration and titling requirements of this part and to the provisions of Part 13 (commencing with Section 5800) of Division 1 of the Revenue and Taxation Code.