Living full-time in an
RV is not inherently illegal. However, it may be illegal to park it for an extended period in places like the side of the road, a business parking lot, or private property without the owner's consent.
There’s a difference between living in an RV and parking it. You can legally live in an RV, but you can’t just park your vehicle wherever and whenever you want.
Every city or county has different rules regarding full-time RV living. If you plan to move your RV regularly, these restrictions rarely bother you.
But if you want to stay at a place (other than RV parks) for a long time, then you’re surely breaking the law unless the property is in a location that permits it. It's always wise to check local zoning laws and regulations before settling anywhere.