This is not totally unrealistic for a relatively nice unmolested '83, especially one marketed by Jonathan Ward. I sold one that was a little nicer (and rarer with vent windows) a few years back for $34K, which was then flipped for over $50K.
http://tlc4x4.com/TruckDetail.asp?TruckID=171#sthash.Z1HBwgKY.6dBnSgzl.dpbs
http://tlc4x4.com/TruckDetail.asp?TruckID=171#sthash.Z1HBwgKY.6dBnSgzl.dpbs