"Upgrading" from popup to TT and need info on TT culture.

Don't automatically rule out Fishing Bridge campground in Yellowstone.
Yes you will be packed in there.
We camped there and used as a hotel for 10 days...
We left in the AM with food, water, bicycles and anything else we wanted. Did not return till night. Only 1/2 day in the campground for laundry etc.
Despite the sardine experience in the campground, I would not hesitate to camp there again as we were really never there. It served us well as a home base.