The KOA has an "interesting" policy. If you want to request a site that is available, when you make the registration, the only way they will guarantee the site is for you to pay an extra $20 fee. Moreover, if two or three RVs are traveling together and reserve adjacent sites (available when registrations were made) the only way they will guarantee you will have adjacent sites when you arrive, is for all parties to pay an additional $20 fee. At least that was their policy last April. They told me it was a benefit they were providing.
Tom