How many make park reservations vs find as you go.

We always know where we will be spending the night in advance. That does not mean we make reservations every place we stop. We call a couple days in advance of our stop and see if a reservation is required. Sometimes reservations must be made way in advance. For instance, we visit family in FL in the springtime and we stay at a state park. A reservation must be made as soon as the reservation window opens or we will not get a site when we want it because the snow birds are still there.