The words hereinafter defined shall each have the meaning hereinafter indicated for the purpose of this article, as follows:
An individual, firm, partnership, corporation or association of persons.
Any vehicle or unit, including self-propelled and non-self-propelled vehicles, used or intended for conveyance upon the public streets or highways, so designed or constructed as to permit occupancy of the vehicle or unit by one or more persons as a dwelling, business place or sleeping place or for other occupancy or use, equipped with wheels or similar devices and capable of being transported from place to place either under its own power or by attachment to a motor vehicle or through other means of transportation.