I had a solve that ended up at Butte, MT. I have not found more than several weak confirmations, though.
One thing that caught my eye was the connection to the strange comment Nels makes about the RV's bathroom having three well-arranged circular modules. It is an odd paragraph, that looks to contain some good info. Anyway, check out Horse Canyon at Butte (Google Earth, Satellite View), northeast Butte.
Oh, there's also a huge QUARRY. Not how I arrived at Butte, and was surprised to see it.
The three round circles, you can find dozens of these. They are a baseball or softball complex fields. It's a common way To build them, 3 fields , with home PlAtte side by side with concession stand serving all three with walkway along side.