I just returned from the rally and my other adventures. Came back a day early due to the predicted Nor Cal storm...
I didn't see any other ATC campers (but I didn't walk around the whole grounds), but many Four Wheel Campers, Arctic Foxes and lots of other makes.
My only complaint and it was also the comments from others camped around me were.
Too few porta potties and no dumpsters for garbage.
Here's a pic of my solar powered ham radio station at the rally.
Other than that, it was pretty fun.