We and friends would like to come tomorrow for one night (2 trailers). How do we find if there is space available?

I've been there off and on for 2 months and I've never seen it full you should be fine

If there is room to set up, then you can. There aren't designated spaces.

Spaces change daily. You would just have to come by and see if there any spots open.

There is usually a lot of space available