I am looking at a first time buy of a 66,000 used MH. That is the asking price. The two prices in NADA , with options included are 52,240 low, and 62,700 high. I am not a negotiator but I don't want to buy at the wrong price and pay too high even though I like the unit. Is there a good rule to follow for a proper price without insulting the owner? Thanks.