We were there this past September. We stayed at Canyon and Madison. Both were nice campgrounds. We liked Canyon a little better since it has showers and laundry available. Also, at Madison we had no cell service. We needed to keep in touch with family back home.
We kept the camper on the truck the entire time. Parking was never a problem. It was great always having our food, clothes and bathroom with us. I installed a group 31 AGM battery before we left. Between our small 50 watt solar panel and the truck charging the battery as we drove we never had an issue with power. We even ran the furnace thru the night.
I had a small issue with altitude sickness one evening. Besides that with the dry air and cool temps we felt no sinus issues like we do back here in Indiana.
Seeing the pictures here and talking about it makes me want to go back soon. It's an awesome place.