Michigan Compiled Laws, Chapter 288. Dairy Industry § 288.740

(a) A mobile frozen dessert plant meets all requirements of this act exclusive of toilet facilities.

(b) A mobile frozen dessert plant has a potable water supply tank, of sufficient capacity, tilted toward a capped drain cock. The water inlet pipes shall be of removable flexible copper or other approved tubing with the nozzle for the hose connection capped and fully protected when not being used. A hose for connection to a potable water supply shall be provided and used exclusively for that purpose.

(c) A mobile frozen dessert plant has a suitable waste tank with a capacity at least equal to the water supply tank that is tilted toward a drain cock with an adequate method of gauging the contents. It shall be emptied and flushed as often as necessary at an approved location, in order to maintain sanitary conditions.

(d) A mobile frozen dessert plant has a refrigerated box of ample capacity for storage of the various ingredients carried that need refrigeration and constructed of noncorrosive material, the floor of which is pitched toward a drain. Temperature shall be maintained at 45°F (7°C) or lower in the refrigerated box, and it shall be equipped with an indicating thermometer.

(e) Mix to be frozen in a mobile frozen dessert plant is packaged in a single service container of 5 gallons or less at the place of manufacture.

(f) A mobile frozen dessert plant has a refrigerated syrup rail with a holding plate to maintain temperatures of 50°F (10°C) or below.

(g) A mobile frozen dessert plant has a refuse can located within the mobile plant and a waste can or container for deposit of cups, papers, and other refuse by customers outside the mobile plant. Both shall be kept clean and so located as not to create a nuisance.

(h) Utensils, equipment, and multiuse containers in a mobile frozen dessert plant are washed and sanitized in the mobile plant after each day's use.