I did a 3 month camphost job in 2008 in a National Park. I found that a lot of folks ignored what I told them, but a guy that was a paid employee of the park was way more effective, and I was glad to have him backing me up. I later went back for a couple of weeks to the same campground (the regular camphosts had left) and had the same problems as before. I think some men just listen to another man and ignore a woman's voice. Most men and women were friendly and really wanted to do what was right and follow the rules, but many just do what they please. I particularly had problems with guys who like to build bonfires - in an area that is dry already, and in a campground that had been evacuated because of forest fire just a few weeks earlier. I spent a lot of time dousing campfires left smoldering when the campers vacated the site. (Sorry to be so wordy.)
I no longer have an RV and when I search the govt volunteer site I look for those that have housing available. Many use former ranger cabins, or have bunkhouses, apartments (usually private bedrooms and shared facilities), and other kinds of housing.
My experience is that I got burned out way before my 3-month commitment was up - as a solo you have to do it all and it's easier with a partner. But try it and see if you can get a shorter commitment with option to extend. Good luck.