I just got a couple from the library, including
Take Back Your Life by Stephanie Bernhagen - along the lines of the content of this forum, and videos, etc., but book form and written in 2000, so probably out of date on some of the details but not the overall gist and philosophy, with some personal stories of full-timers.
The others I got are a For Dummies on RVing, and then one on vehicle living that actually seems more like a dissertation that got published than a useful read - unless you are an academic sociologist or really into statistics.