Absolutely have a mobile rv mechanic inspect anything before you purchase. A few hundred now may save you thousands later.
An Rv will shake itself loose. I have a book i keep on the table and write down everything I need to look at or repair before next trip. Rv's are not maintenance free, far from it. Now, those items are usually minor that I like to keep up on so they don't become big items.
Rent one! See if this is something you want to drive through tight campsites or along two lane roads. Drive it down the interstate and see how it feels when big rigs pass. Back it up, all those fun things to the new camper.
Take your time and get plenty of advice and anytime you see a salesman on the lot moving his lips.....well...he may not be telling the whole story. ( that was being polite) Ohh yeah. extended warranties..... they are a joke. self insure. Whatever the warranty cost....add that to a savings account and pay the repairs yourself. todays engines and drivetrains are very reliable. Don't believe the nonsense "if your engine blows up or your transmission fails....they seldom do.
As was mentioned, have an expert examine for water damage. Take your time, ask questions, talk to those you see with an RV you like, they will be most helpful I'm sure.
Full time. RV's can get small real quick.Look for one that you can keep the necessities and still have living space. Slide outs help a lot.