The title "Preventing RV maintenance" is not right... ;)
You have to always do RV maintenance in order to prevent "RV FAILURES".. :)
Maintenance can be as little as just looking over the rig in general and addressing any issues you see..
After the first year of owning my 2002 TT, I had to re-caulk the roof corners because they didn't 'look right'...
Ever since then, I've checked them at least twice a year and have yet needed to re-caulk. That goes for the rest of the caulking on the roof too.
Everything else is just paying attention to the details and not letting serviceable items go too long without checking them. Brakes, wheel bearings, tires, appliances, etc..
There are a lot of good rigs that roll out of the factory and there are a lot of bad ones too... Which one you get is a roll of the dice.. Even if you special order it!
I bought mine off the lot because it had everything I wanted and what it didn't the dealer could add easily (A/C). I looked that rig over pretty well, (except the roof...) and liked what I saw and made a note of the VIN when the final deal was made.. When I picked up the trailer, I made damn sure the VIN still matched and did another walk thru with all the systems up and running and one of the dealers techs showing me all the systems.
Anyway, once you drive it off the lot, it's your's and how you choose to maintain it is up to you..
Yes, storing it indoors is a plus, but it's not an excuse to not keep up with the RV's maintenance for other stuff and just plain keeping it in good shape..
Good luck!
Mitch