few questions about a RV I am buying

Yes the unit is very clean, does not looked used ( like stains , dirty carpet ) I did tell them I would be a buyer closer to 40k, they said they just could not do that, and I understand they are in the business to make money not lose money. And I understand that ,( just don't want to be the person that ver pays ) people should not think they are going to get something for free. I just told them I have been looking around and truth be told so far 47k with slide toppers added is not off base from what I have seen so far. Just I did not know what slide topper cost and wanted to make sure I was in the ball park with the price. I have bought enough new and used RV,s before and when I have bought new its worse than a used car as for lose of value quick
so I figured with a 2 or 3 year old unit the first buyer took the bath ( I hope ) and has worked out the bugs, or at least I hope its not the reason they got rid of it..