Custom Series D-19 30 Deluxe & Special D-21 13 Deluxe Series D-19 30 Kingsway D-20 13 Medium & Heavy Duty Truck 23 Mil. WC 1/2 ton 12 Mil. WC 3/4 ton 13 Pickup & Light-Duty Truck 23 WC 23 WD15 18 WD20 18 WD21 18