A manufactured home is a structure that meets the following requirements:
(1) It is transportable in one or more sections;
(2) Its body is eight or more feet wide or forty or more feet long in the traveling mode or it occupies three hundred twenty or more square feet when erected on a site;
(3) It is built on a permanent chassis;
(4) It is designed to be used as a dwelling with or without a permanent foundation when it is connected to the required utilities.
The term includes the plumbing, heating, air conditioning, and electrical systems contained in the structure. The term also includes any structure that meets all of the requirements of this section except the size requirements and for which the manufacturer voluntarily files a certification required by the secretary and complies with the standards established under this chapter.