While I do sometimes sleep in Wal-Mart lots, it's usually because I am
forced to do so by circumstances.  I've 'stealth-camped' in many cities with
few incidents, too.    My Mall-Wart visits usually only occur when I am on a
schedule and am forced to do the freeways or interstates to arrive somewhere
for some event.. When I start to get too tired to continue driving safely, a
Wal-Mart looks good for a few hours sleep.  I usually try to go inside the
store the next morning and buy at least a coffee or something for my trip
before I exit the lot.  Karma..  I began the Wal Mart stops when I was
hauling my racecar in a trailer because I could get in and out of the lots
without problems with the long rig..
  Just pulling off on a side road and sleeping in an isolated area...I don't
usually get a good rest..every car wakes me as it passes, every strange
noise is suspect..Especially in areas near interstates, which seem to be a
little 'rough' some places..
  In a Wal Mart lot with a few motorhomes around, I figure..Who'd bother
with a 25 year old VW camper when there are big ritzy RVs with more 'stuff'
around.  They would  make better targets for some crack-head or meth freak
looking for $..
  I also travel with protection and some big dogs.  The dogs do make in town
stealth camping difficult..
  Don Hanson