RE: Overnight at Walmart
This is a common and frequent topic on the various RV and RV fulltimers
forums.
Walmart policy varies from store to store and town to town.  No parking in
many towns where the locals have outlawed it, usually because of pressure
from commercial RV parks that think they are loosing business.  Other have
banned overnight parking because of abuses by campers.  And at least one or
two because the neighborhood has become to dangerous.  There are many sites
on the Internet listing stay/no stay Walmarts and even iPhone and Android
apps for those listing.  And the protocol remains the same, go in and ask
the manager if it's okay even if there are others already parked.  And buy
something.