As said, Florida is a large state. We need more info about what your preferences are. We'll start our "winter tour" of Florida this winter at Ft Clinch State Park just over the Georgia line, and then work our way south until we get to Midway Campground on the Tamiami Trail in the Big Cypress National Preserve section of the Everglades, before we start working our way north again. And we frequently see 40'+ coaches in state parks like Myakka River near Sarasota, Alafia River near Lithia, and the NPS Midway Campground near Everglades City, plus many others. They all list site lengths on Reserve America and Recreation.gov.