Am I Being Unreasonable?

If it stayed at my place you would be more than welcome to stay in it. I would tell you the good and bad about it and then leave you alone to look it over and feel it. I wouldnt want anything disassembled. As you went along you could make a list and then go over it with me. You are buying used so there is risk. I compare it to buying a used car. If I buy a used car I'm taking a risk that the transmission or engine or whatever could be bad or have been abused. So I look for the best looking and best running car. If I do get burned on it I still have a good looking car that I now put a transmission in. If I had settled for a not good looking car and I had to put a trans in it I now have an ugly car for along time with a good trans. So as it pertains to RV's I would break it down in this order. Number one would be water damage. I would be absolutely sure that it has no water damage as its just too costly to repair. Number 2 would be how presentable is it. If it has a lot of dings, dirty upholstery, scratches, worn cabinets, yucky cook top, and on and on, you will be stuck with it and have to look at it.
You may not be able to stay in any of them that you shop for but you can look them over very closely and if they dont like it then walk away. After water your biggest risk by price of item is the frig, ac unit, furnace, water heater, toilet, water pump, ceiling fans. Tires are easy as you should be looking at date codes and BRAND as part of the negotiating.

Get on top and feel all over and around all the items up there for soft spots and buckling plywood.