Wal-Mart parking in New England

I am currently in the Bar Harbor Maine area and stopped at Wal-Mart because I observed several RV's in the parking lot. I asked management if it was ok to park overnight and was given the ok. They say the RV park owners don't like it but Wal-Mart wants the business, so they don't care. There are signs at the entrance that says No overnight parking but it is ok. Just thought people might like to know.
Bill & Jean