IOWA 1970's-80's RA = Truck (1 yr) RB = Truck (1/2 yr) RC-RF = Tractor (1 yr) RG-RJ = Tractor (1/2 yr) RK = Rental Trailer RM-RS = Trailer (1 yr) 1990's Px = Power Unit (Truck) Rx = Trailer 2005 Sx = Power Unit (Truck) Tx = Trailer   1978 TRUCK 1978 1/2 YEAR TRACTOR 1979 TRUCK   1979 1/2 YEAR TRUCK 1979 1/2 YEAR TRACTOR 1979 TRAILER   1980 TRACTOR 1980 1/2 YEAR TRACTOR 1980 TRAILER   1981 TRACTOR 1981 TRACTOR 1982 TRUCK   1982 1/2 YEAR TRACTOR 1982 TRAILER 1983 TRUCK   1983 RENTAL TRAILER 1983 TRAILER 1984 TRUCK   1984 1/2 YEAR TRACTOR 1985 TRACTOR 1985 TRAILER   1986 TRACTOR 1986 1/2 YEAR TRACTOR 1987 POWER UNIT   1988 POWER UNIT 1989 TRAILER 1990 POWER UNIT   1992 POWER UNIT 1993 POWER UNIT SAMPLE POWER UNIT   1995 POWER UNIT 1996 POWER UNIT 1997 POWER UNIT   PERM TRAILER 1998 POWER UNIT 1999 TRAILER   2000 POWER UNIT 2001 POWER UNIT 2002 POWER UNIT   2002 POWER UNIT c.2002 PERM TRAILER 2003 TRAILER   c.2004 PERM POWER UNIT c.2005 TRAILER VANITY POWER UNIT   VANITY TRAILER