Agreed, Most RVer's are a good bunch and if your by yourself, will watch after you.
Advice:
If your likely to be staying at campgrounds/RV parks where there are plenty of other people, make it a point to be outside, meet some of them once you get set up and make some friends. Safety in numbers when everyone is watching out for each other.
If your a boondocker that might be out in the wilderness by yourself, a large can of wasp spray by the bed is a great substitute for pepper spray. Gives you more distance and temporarily blinds any attacker.
A ball bat or billy club like police carry is a good, usually non lethal, defensive weapon once you get a bad guy sprayed with the wasp spray. knocks them down so you can get out and get help.
Likely, you'll never need either of these last resort defensive tactics but they are cheap and effective if you do.