Congratulations on your new-to-you project RV. It sounds like you have the right aptitude and attitude to make this an adventure rather than a horror story.
While it is likely the roof hasn't leaked yet, it is possible that moving it will create those leaks, so the first thing I'd tackle is the roof. It might not rain much in your neck of the woods, but it might not be a bad idea to throw a tarp over it when you get it home until you can reseal that roof.
Lots of experts on here to answer questions and help with advice. Some of it may actually prove useful. Good luck, have fun, and May the Force Be With You!
