As used in this chapter, the following terms shall have the meanings indicated:
Any vehicle used or intended for the use as a conveyance upon the public streets or highways and duly licensed as such, and shall include self-propelled and non-self-propelled vehicles so designed, constructed and reconstructed or added to by means of accessories in such a manner as to permit the occupancy thereof as a temporary dwelling or sleeping place for one or more persons, and having a foundation or on wheels, jacks or skirtings so arranged as to be integral with or portable by said "trailer" or "camp car."