so, if you read and study the "first timers and survival" guides, as well as info on the main Burning Man website, you'll get a lot of your questions answered, and, probably, learn some questions you didn't think of.
RV's are perfectly fine..........the big thing, is, as with all, is respecting others.
Other than that, they're only resented by those jealous, or "burnier than thou"..........
the only restriction to where RV's can camp, in "walk in" areas and, otherwise reserved, as in theme camps, Esplanade, etc.
There are many "RV" threads here on eplaya, you just gotta dig for them.
Be sure to do your homework, related to renting. Whether an RV or "box truck".......some places will not allow it to go to the Burn.
There is no "reserving" spaces, so, you'll get what you get, when you get there.......the only caveat, may be, if you have friends that get there early and can save you a spot.
otherwise, do your homework, and, if you can't find the answers, ask here.
Just, be prepared for snarky answers if the answer is to obvious.......or, at times, snark, just for the fun of it.
good luck and welcome