"Automobile or boat transporter." A truck of a total length not greater than 45 feet, exclusive of an overhang of not more than three feet on the front and four feet on the rear of the vehicle configured by the manufacturer to haul either automobiles, light trucks or boats.
"Towaway trailer transporter combination." As follows:
"Trailer transporter towing unit." A power unit that is not used to carry property when operating in a towaway trailer transporter combination.
75 Pa.C.S. § 4923