Buying a known (?) problem

Just looked up all 2004 Gulf Stream 28' 5th wheel model trailers on NADA and the highest was $10,900 average retail and low retail was $9,100 or less for the deluxe model but you have to add a little for true extra options added that were not standard. They (Gulf Stream) were low priced 5th wheel when new so they will be worth less used. Based on that and being 10 years old now with known rot from a leak, I can see where $5,000 to $7,000 would be a reasonable price depending on options added and actual overall condition and having decent tires with the known leak rot. New tires would be north of a $600 expense to add to the repair list. Just my opinion. However, if I could buy it cheap enough and am quite sure the rot damage is reasonably known, I would buy it personally and fix it up as you should be able to turn a buck even if you eventually don't keep it after a years use. It will always be worth more selling it in the spring VS fall/winter. Turn a buck is what you do with your used car lot so that part is known!