A dealer in recreational vehicles and recreational vehicle trailers or a dealer in boats and boat trailers who has received such a registration and plate may only operate with said registration trailers owned by him and held for sale and demonstration.
A farmer who has received such a registration and plate may only operate or tow a vehicle or trailer under said registration and plate principally used for and dedicated to carrying on a farm related activity. Such registration and plate may not be used on a passenger motor vehicle.
A transporter, as defined in section one, who has received such a registration and plate may only operate with said registration a motor vehicle or trailer not owned by him and only in the course of such business.
Mass. Gen. Laws ch. 90, § 5