We're "longtimers", rather than "fulltimers", but we too never make advance reservations except for a few state park visits where we have specific site preferences, or the occasional holiday weekend when the CG's in the area we'll be in are often packed.
Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate