The Big 3 started in 2009 so you are fine in that respect. I would still inspect the sidewalls for delamination and paint checking (problems that plagued all makes in that era), roof, and look at things like the wet bay floor. Get maintenance records for the engine, transmission, etc.
The price is too high, BTW. See if you can find out what the owner originally paid for the unit and then depreciate it at 7% the first year, and 5% for the next five years or so, and then 2-3% a year for the remainder. I think you will find the value more in the $10-20,000 range.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)