South of I-4 between Christmas and New Years no reservations

The reason Flying J in Dade City and Dover don't allow parking is that their lots are too small. The Flying J in The Cracker Barrel in Brooksville has RV parking spaces. But there are only 4 or 5 spots and there will be lots of people looking for places to stop. Most cities and counties in FL don't allow RV parking except in designated areas. Most state parks will be full even during the week. Quail Run RV Resort in Wesley Chapel (just north of Tampa) may have some spots but their winter prices are $50-$70 per night.