Reservations are plans to deviate from:)
1. Always ask for the cancellation policy details, cost etc.
2. Generally, RV areas that are popular, i.e. yellowstone, Oregon coast, calif. coast, state parks, lakes, etc. are where reservations would be in your best interests.
3. You have everything to gain and nothing to loose by making a reservation as you can always change your reservations and/or make new ones.
4. Making reservations does not restrict, control or lock your RV life style or adventures.
5. Nothing worse than starting to start looking for a RV park at the end of day when you are dead beat and tired:)
Just my opinion:)