[Junior Guru]

At a 2005 you are only a model year or two away from getting to around $200,000 for a newell.   The old adage "price is what you pay.  Value is what you get" really applies with your situation.  There are plenty of $200,000 Newells that are better values than coaches costing much more that are newer.   10 years is such an arbitrary number.  A well maintained newell (or prevost) at 11-13 yrs is often time a better value than another newer coach of the same price.  Lenders do not always understand this.  

With all that said, I too would avoid fiberglass walls and rubber roofs.  At 6 months plus of usage per year, your usage of every thing from heating system to door knob swill be high, so factor in things like everyday wear and tear on doors, cabinets, heating system, water system, toilets, etc.