California Code, Health and Safety Code - HSC § 18080

(a) A manufactured home, mobilehome, commercial coach, truck camper, or floating home may be registered in the names of two or more persons as joint tenants. Upon the death of a joint tenant, the interest of the decedent shall pass to the survivor or survivors. The signature of each joint tenant or survivor or survivors, as the case may be, shall be required to transfer or encumber the title to the manufactured home, mobilehome, commercial coach, truck camper, or floating home.

(b) A manufactured home, mobilehome, commercial coach, truck camper, or floating home may be registered in the names of two or more persons as tenants in common. If the names of the tenants in common are separated by the word “and,” each tenant in common may transfer his or her individual interest in the manufactured home, mobilehome, commercial coach, truck camper, or floating home without the signature of the other tenant or tenants in common. However, the signature of each tenant in common shall be required to transfer full interest in the title to a new registered owner. If the names of the tenants in common are separated by the word “or,” any one of the tenants in common may transfer full interest in the title to the manufactured home, mobilehome, commercial coach, truck camper, or floating home to a new registered owner without the signature of the other tenant or tenants in common. The signature of each tenant in common is required in all cases to encumber the title to the manufactured home, mobilehome, commercial coach, truck camper, or floating home.

(c) A manufactured home, mobilehome, commercial coach, truck camper, or floating home may be registered as community property in the names of the spouses. The signature of each spouse shall be required to transfer or encumber the title to the manufactured home, mobilehome, commercial coach, truck camper, or floating home.

(d) All manufactured homes, mobilehomes, commercial coaches, truck campers, and floating homes registered, on or before January 1, 1985, in the names of two or more persons as tenants in common, as provided in subdivision (b), shall be considered to be the same as if the names of the tenants in common were separated by the word “or,” as provided in subdivision (b).