If you are buying used. The number one thing you need to look at is the roof. Get up there and make sure all the seams are sealed properly and look like they have been maintained often.
Also take a look when you are at the used RV lots and see what a particular brand used RV is selling for versus another brand. And how many of that brand are still sitting there month after month.
THAT will tell you how they hold their value and where on the food chain they sit regarding quality.
In my experience I saw many Winnebago's on the used lot priced at low selling prices. You won't see that many Four Winds and if you do they will be higher priced. Something to think about and ponder. :W