"Towaway trailer transporter combination" means a combination of vehicles consisting of a trailer transporting towing unit and two trailers or semitrailers that carry no property and constitute inventory property of a manufacturer, distributor, or dealer of such trailers or semitrailers.
"Trailer transporting towing unit" means a power unit that is not used to carry property when operating in a towaway trailer transporter combination.
Va. Code § 46.2-1117.1