In anticipation of possibly full timing in retirement I am doing some playing with budgets. Other than the RV loan (no I can't pay cash, and no my home has not been an appreciating asset so a loan is ...
My last trip (304 days) was a mix of Commercial, National & State Parks, and BLM dry camping. Average $22.41, ranging from $0.00 at Quartzite BLM & the O'Neill City Park in NB to $65.46 at St Mary KOA, St Mary, MT (outside Glacier National Park).
Here is the spreadsheet for the campground costs for the trip.