WASHINGTON PR = Power Unit RP = Power Unit (2005 issue) TR = Trailer APPOR. COMBINATION (sticker) =       Tractor   1988 1988 1989   1990 1990 1991   1991 1992 1992   1993 1993 TRUCK PLATE 1994   1994 1994 TRUCK PLATE WITH APP COMBO STICKER 1996   1997 1998 ERROR - NO LEGEND !! 1998   1998 1998 1999   1999 UNDATED, BUT A '99 1999 2000   2000 2001 2002   2002 2003 2003   2003 2006 2006   2006