Are there any camp sites available as of 8th of December what r the rates n can we just use our pathfinder to sleep in while we r there. How long can one stay?

You cannot just show up without a reservation as you run the risk of bit having a space. Call them in advance and try to make a reservation to learn about availability and check if you can just park your SUV and stay in it.

You and or the camper can only stay for 6 months.

You can stay for months or a day. Call the camp site for availability or reserve.