Boondocking in Montana

Thank you for the replies. I'll be checking out the links soon. I worked trimming trees in Eastern Montana and some of North Dakota all summer last year so unfortunately I know about the boom problems. Fortunately the boom has not spread this far west and I hope it doesn't. I did go to the forest service in Helena and talked to them but all they wanted to do was sell me their map. Unfortunately we don't have a Cabalas or Cracker Barrel in Helena. The Walmart allows overnight parking but I am hoping for something a bit more rustic where I could set up for more than a few nights. The season hasn't started so some of the campgrounds near here aren't open yet. I will probably just camp at Walmart for a few days if they'll let me so I can be close to my storage unit and get out things I want in my trailer. I can take drives to scope out the area while I'm at it. I'll check back in again soon in case there are any more suggestions. Thanks again.