This is great question. I too am renting an RV for the first time. I'm not arriving in the evening but there has been some discussions regarding Generator usage (which is why I rented an RV), fires, etc. So it would be nice to know proper Etiquette for the event. Right now, I think we should just use our best judgment and be patient and courteous to each other. As far as arriving at 11, I can't answer that. You may want to send a private message to FlyingMonkey - he's in charge of the volunteering efforts may be able to shed some light. To be honest, I don't think a lot of people will be sleeping during the event.
I should be arriving at ~4 PM on Thursday and I'll be more than happy to ask the FT team and call you with the answer. PM me and we can exchange cell numbers.
-David