Why is it that Walmart doesn't allow overnight parking for Semi Trucks. Do they not know that without Rigs the stores would be empty.

I believe that they do let you ... I imagine if too many of them do it, it's not going to be okay, but I've seen Trucks park. If you are having a problem, it may be that someone outside of Walmart has complained. Who knows, really?

I have seen trucks and campers parked there..

Its not a superwalmart its only a grocery walmart not very big walmart