I have a couple of friends that just spent 90 days in Montana and Idaho. The only time when they did not hook up is when they met up with me in WY. They were in a TC just like mine. They were on the battery one night and he could not believe how few amps they had used that night, including running the furnace. The whole dry camping experience was strange to them. I estimate they spent 4K on C/G's. They also drove hundreds of miles passing up places to stop for the night just so they could get to FHU's.
I just spent six weeks in the west and spent $66.00 on C/G fee's. Those were NP's and a NWR.