I have a family of 8 6 kids myself and wife are TT sleeps 9 comfortably but I noticed allot of the camp grounds state 6 max per site what do large family's do ?
I was wondering the same myself. I guess it's on a per-park basis and if you call the office, explain your situation, they probably all would grant an exception.
The rule is likely there to prevent 29 college students on a bus from running the place over.