Many snowbirders leave their home for Florida right after Christmas. Also, after Christmas is usually the school break time. If your travels are before Christmas I think you'd find spots without reservations - except at Disney World.
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Full-Timed for 16 Years
.... Back in S&B Again
Traveled 8 yr in a 40' 2004 Newmar Dutch Star Motorhome
& 8 yr in a 33' Travel Supreme 5th Wheel