No trailer which is commonly used for living or sleeping purposes, whether actually being so used or not, may be kept, maintained, parked or occupied on any privately owned property within the city, unless the property on which the trailer shall be situated is zoned and utilized for commercial trailer sales or as a trailer park or camp, unless such trailer is kept entirely within a closed building and is not used for living or sleeping purposes, or is defined as a recreation vehicle by Chapter 20 of this Code and is parked or stored in accordance with that chapter.
(Code 1958, § 30-3)