i have a kindle and read the book. althougth walmart is in the title there is surprisingly little about their wal-mart stays.
the author did have a time and money limit to their trip. they actually stayed in a lot of paid campgrounds and some hotels.
walmart was more of a secondary last minute place to stay rather than primary place to stay although they would look for non-paying places to stay
they also did not have the luxury of a lot of time at one place to do classic boondocking.
staying 2 weeks in one out of the way 'boondocking destination'
is not the point.
they were 95 percent tourers
I suspect boondocking and walmart got a lot of people to look at the book. Another title may not have gotten many looks