Have you looked at the roof yet? The inside will need some love, flooring all needs to be redone, you will need to find some sort of roll up carpet. Those were also "budget" trailers to begin with, which shows in the quality of materials used in the kitchen.
If you are a handy person, you can buy it for half of what he is asking and put money into it. If you would rather vacation in it instead of working on it then I would keep looking, there were lots of MFR's that made that design (front bed, lots of storage) in the 2000-2010 year range.
Good Luck!