Finn:
If memory serves, they let you into the facility 6 pm and after. However, after 10 pm you may ahve to wait for the guard to show back up at the gate to let you in.
Its 10 bucks to tent/ sleep in your car camp.
And something like 40-60 bucks with electricity for a RV. Don't quote me on this one becasue I can't quite remember.
BZ