As used in this chapter, the following terms shall have the meanings indicated:
A vehicle, commonly known as a "house trailer," designed to be used for living, sleeping or office purposes and which is so designed that it is or may be mounted on wheels and used as a conveyance through its own or other mode of power.
Any camp trailer, travel trailer or other unit built or mounted on a vehicle or chassis designed without permanent foundation, which is for temporary dwelling or sleeping purposes, but shall not include any vehicles which are too long or too heavy to be towed by an ordinary passenger automobile.
A person whose principal occupation is that of construction or related trades.