We also have a 2002 Prowler fifth wheel. We have had very good luck with it. It is our first RV and the only real problems we have had was from our own lake of Rv experience.
Make sure you check the tires. find out how old they are. Tires only have a certain life span. If they are China made, at least make sure they are from a brand that you know. Not a "Good Ride" instead of "Good Year"
Check for any mold spots or water damage. If you can, have the owner take a hose and spray water all over it and check for leaks. I have actually heard that if you want to check out an RV, do it during a good downpour.
Make sure everything works. Try it all out. Water heater, Ac and furnace, slideouts, fans...anything and everything.
We were very lucky with our Prowler. We plan on keeping it for a few more years until I retire and then will move up to something else for longer trips.
Hope this helps some
The Lost Travellers,
Bruce and Connie
The Lost Travellers
Bruce and Connie