IDAHO A = Power Unit / Tractor B = Commercial / Truck C = Trailer   1976 TRUCK 1976/78 TRUCK 1981 TRAILER   1982 TRAILER 1983 TRAILER 1984 TRUCK   1984 TRAILER 1985 TRACTOR 1986 TRUCK   1987 TRUCK 1988 TRUCK 1992 TRUCK   1993 TRAILER 1996 TRACTOR 1997 TRUCK   1998 TRUCK 1999 TRUCK 2001 TRACTOR