Not required but highly suggested on the weekends.
No, you aren't required to have a reservation. You can arrive, drive through and see what sites are available, then do self registration. It helps during the busy season though because most people make reservations and it books up pretty quickly.
Yes
Sometimes
Yes you need resv. Get tickets in January for June..that's how fast it fills up. Getting the early is good to cuz you can find a spot..
Yed
Thanks! Your answer is awaiting moderation.