You'll have to do a lot more work these days to get the hell away from other people in Montana, but IT IS still possible. We just have to adjust our destinations and find legal lands or State Parks that aren't at the top of everyone's list.
So, I saw this on a flatbed truck this morning heading east out of Bozeman. The marquee on the front of the bus labeled itself as the "Hobo Hut". Their words, not mine.
You've at least driven right by it 100 times, as this RV campground is smack in the middle of Ennis, Montana. It's been for sale for just a few weeks according to Realtor.com but it's now listed as "Pending".