Although the lifestyle doesn't appeal to me, I know it is great for a lot of people. I think dipping your toe in the water with a few rentals is clearly the best advice.
And on the financial side, RV's are the subject of many financial horror stories for one simple reason: people who sell their houses and buy an RV sometimes forget that they are trading an appreciating asset for a depreciating asset. Yes, I know it seems like home prices aren't appreciating these days, but we know that over time, they do.
The danger is that seniors who make this "swap" with little in other assets run the risk of outliving their home. Financial planners call them the "RV homeless" when they wind up with a broken down, useless RV, good health, and not much cash. Apparently it happens with great regularity.
Just a word to the wise.