I think that during a transition period you will see some campgrounds putting in 250kw chargers for electric trucks with separate charging fees, probably near the main power feed to the campground. Getting power to all of the campsites will take time and money but private campgrounds will respond to demand. Sadly, if history foretells the future, government campgrounds will be the last to upgrade their infrastructure.
We really need to let the National Park Service set their own fees and manage their own budgets so that they can expand to meet demand.