As used in this chapter, the following terms shall have the meanings indicated:
Any vehicle, house car, camp car or other type of portable vehicle, whether on wheels, skids, rollers or blocks, to be used for living or sleeping purposes.
Any premises on which are parked two or more trailers, or any premises used or held out for the purpose of supplying to the public a parking space for two or more such trailers.
Any premises in which unoccupied trailers, new or used, are parked for the purpose of inspection or sale.