An RV is a mobile home, it has all the trappings of a home except for size, and for some of those RVs the size was bigger than my smallest apartment. It's just exchanging one set of stuff for a more mobile set of stuff, but not exactly minimalist.
Those couples that I've met that did the 'RV thing' after their pension typically saw it as a way to do all the traveling that they had missed out on while in their working years, a way to reward a lifetime of hard work.
In the future when nobody has enough money to buy a house or a bunch of stuff in the first place we'll probably be seeing more nomadic seniors.