Like most 'un-written' or assumed privileges,  if you seek to 'define' the
'rules'  you'll find we'll all be denied.  I hate it when I see stuff like
"Wal-Mart overnights" being wrecked, but it seems to be on the way out. When
pushy travelers start to 'assume' that camping in Wal-Mart is a right,
rather than just something that's "benignly overlooked" as a matter of
course, when people deploy their awnings and set up barbies at 4pm in the
lot...Not good..
  As soon as someone really "steps in it", Wal-Mart's legal staff will
'intrude' and mandate that nationwide the stores prohibit overnight parking
in their lots...likely they will cite "Insurance or Liability"..and then you
WILL get ticketed for parking there overnight, or have some cop banging on
your van at 3am telling you to move on...
  Too bad, because the late night Wal Mart snooze was often the only real
alternative, in some areas, to keeping on driving till you fell asleep or to
renting a $100 motel bed for an hour or two..
  Don Hanson