As used in this chapter, the following terms shall have the meanings indicated:
A fully enclosed, detached and self-supporting structure, by itself incapable of motion or movement, designed for or used in the packing, shipping, movement or transportation of any goods, materials, or merchandise, except those units designated for garbage and trash. The unit must be manufactured/assembled off site and transportable, by means other than its own, to a location where it is set into place on grade and not upon a foundation or wheels. The unit shall not be refrigerated nor contain any motors or noise-generating equipment. Storage of hazardous materials is prohibited. It shall be made of metal or a similar stable, durable and acceptable material and shall not include a foundation, electricity, plumbing, external illumination, or other mechanical systems as part of its assembly or use.