- Passenger Cars and Station Wagons 6 - Buses (11 or more passengers) 8 - Ambulances 7 2320 Trucks and Truck Tractors, Wheeled * 17.96 - Less than 12,500 (payload 1 ton and less) 6 - 12,500 through 16,999 (payload, 1-1/2 through 2-1/2 tons) 7 - 17,000 and over (payload, tons and over) 9 - Multiple Drive Vehicles 6 2330 Trailers 23 10.09