Many use Walmart lots as a free place to park over night. That said some people confused long term camping with over night parking. Some RV people stay multiple nights. Some for weeks, months and even years (homeless).
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This number has been declining as zoning laws and city ordinances are increasingly banning overnight parking. Store managers may also not allow it. According to Walmart's website, “Permission to park is extended by individual store managers, based on availability of parking space and local laws.
Free RV camping in Florida can be found at dispersed campsites in national forests and some public lands, in addition to Walmart parking lots, Cracker Barrel parking lots, and some rest areas along highways.