PIREP on Gregory SD. I camped there (tent) a few weeks ago. Spoke with Alex the manager by phone (http://airnav.com/airport/9D1
for number). He said no one had ever asked before, but he was totally fine with my pitching a tent. There's some grass of to the side of the tie downs, and a pilot shack with microwave. Also there's a courtesy car too. Only real negative is that the fuel price isn't great but I was glad to pay a little more in order to avoid paying for lodging. Over all thumbs up!