To levy upon personal property used as a dwelling, the levying officer shall serve a copy of the writ and a notice of attachment on one occupant of the property. Service on the occupant shall be made by leaving the copy of the writ and the notice with the occupant personally or, in the occupant's absence, with a person of suitable age and discretion found at the property when service is attempted who is a member of the occupant's family or household. If unable to serve such an occupant at the time service is attempted, the levying officer shall make the levy by posting the copy of the writ and the notice in a conspicuous place on the property. (CCP 488.415, 700.080)
House trailers and mobilehomes are classified as personal property capable of manual delivery when their wheels have not been removed, and they have not been so connected with the ground so as to become a fixture of the realty.