Don't pay more than NADA Retail for any motorhome. Some RV dealers start adding all the extras on top of the retail price, run don't walk out of those dealerships. I bought my last Motorhome from a dealer that was on consignment. It sold for close to trade in value, this is what you want.
If you have access to a credit union they will tell you what to pay for your new/ used purchase as mine does. Don't buy a motorhome if you can't afford the payments on a five or six year loan. You will get underwater too fast. You'll end up with no equity and even have to pay perhaps thousands to trade in or sell.
The first thing to look for is water leaks. Push on walls below windows if they move that's delamination, look out, almost impossible to fix. If the floor isn't solid it's water damaged, fixable but any dealer repairs are expensive. If you aren't a do it yourselfer, you'll end up spending thousands in maintenance on RV's. $100 an hour and more is the going rate, every fix is a one hour minimum usually.