This is sort of 'boondocking lite' because we were in a campground with bathroom and shower.
We took our first trip in our (new to us) 1974 Prowler. It's actually in good shape, given its age, no roof leaks or anything else. In getting ready to go, we found a leak in the plumbing that will need to be repaired, so we were basically dry camping this trip. We went to a spot called Home Ranch Bottoms (homeranchbottoms.com) next to the west side of Glacier National Park. There is a small store there, along with a restaurant/tavern, and they rent spaces in their large gravel parking lot. The spaces have water hookups, but no electric (they are off grid) and no dump facilities. However, they are only $22/night, $20 if you don't hook up to water, and you do get the use of the bathroom and a nice shower (shower is an $7 for each). If you don't feel like cooking, the restaurant has barbecue, burgers, etc.
The campground itself is nothing much, just a big gravel parking lot, but the owners are very very nice, and you can get to all sorts of spots for hiking, trailwalking, picnics, fishing, whatever you like, with just a short drive - 30 minutes or less for most of them. We had a wonderful time; we were the only people at the facility, drove all over Glacier scoping possible future camping spots, etc. It was a great first trip and everything we hoped it would be!