Mich. Comp. Laws § 257.21: “Implement of husbandry” defined.

Sec. 21.

"Implement of husbandry" means a vehicle or trailer in use for the exclusive function of serving agricultural, horticultural, or livestock operations. Implement of husbandry includes a farm tractor, self-propelled application-type vehicle, farm wagon, farm trailer, a vehicle or trailer adapted for lifting or carrying another implement of husbandry being used in agricultural production, or any substantially similar equipment used to transport products necessary for agricultural production.