Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.79f

Sec. 79f. “Boat lift” means a vehicle owned and operated by a marina or watercraft dealer in a commercial boat storage operation with a framework designed to surround or straddle a boat and lift the boat from water or a storage space using a sling and hoisting mechanism. A boat lift shall be specifically designed for and used exclusively to transport a boat between a place of storage and a marina or in and around a marina. Boat lift does not include a boat trailer designed for normal or routine transportation of a watercraft.