Generation after generation of human beings have aged in place. Charlemagne aged in place in his posh palace. So did Queen Victoria. Thomas Jefferson aged in place at Monticello. Poet Carl Sandberg aged in place in his house by the side of the road.
Money is a necessary catalyst for such movement.
The RV lifestyle is a creation of the American middle class. Money in sufficient quantities became available to members of the middle class in America after World War 11. Trailers and self-contained recreational vehicles became the means and transportation to live elsewhere. RV parks sprouted throughout the Sun Belt. It is important to understand that these RV parks are not encampments.