any motorized road vehicle (including tractors with or without trailers) which by its type of construction and equipment is designed for and capable of transporting, whether for payment or not: - more, any automobile, truck, tractor or other motor vehicle or machine used alone or in combination with a trailer or semi-trailer in the commercial carriage of passengers or goods and driven, propelled, dr, a motor vehicle having permanently attached thereto a truck or delivery body and includes ambulances, hearses, casket wagons, fire apparatus, buses and tractors used for hauling purposes on the highwa