In 2019 the rules were easy. When you get there if theyre gone for the day (3pm) you set up and you can check the pay chart to drop your cash in the slot at the door (i dont reccommed as I was told they disnt get mine) or go pay in the am. If you sleep in, its okay, theyll stop by to register you and collect around 11am. Check the chart b4 pulling in. The top spots usually the only RV spots

Around 1PM on Tuesday and they had 2 RV sites. You can call the ranger and see how many sites remaining.