I'm considering the purchase of a 2003 R21 from a friendly private party. We don't know what the price should be. It is the R21, not the EC. Has 3GM30F. I don't know the hours. No marine head, no stove, no refrigerator, no trailer. Just the R21. Do any of you who have sold/purchased recently have some estimate ranges to share. Nadaguides lists about $12k?