OK, what I've decided on is beef and wild mushroom stew made in a crock pot the day before, stored in Ziplock bags (after it's cooled) in the cooler, and simply re-heated on site. I'll bring two pots, to speed the process.
Another person is going to bring cheesy bread of some sort (I'm for some reason really wanting to put the bread rolls on a stick and make people eat it that way, seems more "campery" to me to eat food on a stick) and dessert. I don't care if she makes them or buys them.
So stew, bread, and dessert. Simple, hearty, yummy.
Thank you guys for all your input.