Kansas City Walmart Supercenter

We saw on this app it was allowed.  When we got there security advised no overnight parking.  I went in and confirmed with manager...they no longer allow it.  Not sure if it is due to Corona Virus or not.  We ended up staying next door at Cracker Barrel with 4 other rv's and app showes no RV parking at cracker barrel.  Not sure again. If due to Corona Virus

There are signs posted all around the parking area that say that overnight parking is prohibited and that the area is under video surveillance. 
Went inside and spoke to S who said as long as you come in and ask permission it's ok to park overnight.  
We also noticed that to the right of the Walmart is a Cracker Barrel that welcomes RV's and travel trailer but NO trucks. If we didn't already settle in here at Walmart we would have moved. There are two tractor trailers with their engines running and hopefully that won't last all night.
Update in the morning...

Stopped in at this walmart last night for some supplies in the evening. While I was in the checkout line I asked the clerk if there was a manager I could speak with. Not surprising they seemed a little alarmed (my fault), she asked if there was anything she could do. I kindly asked if they allow for RV travelers to rest in their lot at night. She kindly smiled and said, oh I can give you permission, then instructed me on where they prefer me to park and wished me a good nights sleep. She even gave me recommendations for the best places in their area to get breakfast. It was a nice, quiet evening and no one bothered me at all. I left rested and refreshed at 5am.

Called the main phone # on 10/7/17, and asked if I could park my travel trailer overnight.  The lady who answered said "No", and told me to go to a rest area North of KSC.

This place is great. I traveled her may 27, 2017 from chicago and was afraid this area would be a sh** hole. This area is actually nice and safe. The lot is clean, traffic is minimal after 11pm. I purchased a twin blow up mattress here at the Walmart, blew it up, and slept in my Montero. Parked by the entrance of the lot right off the road. There were two large RVs parked, and 3 other SUVs which I'm assuming PPl were camping out in....

No problem parking. As you pull in and are facing the store, go all the way to the right. There is a rear and a front lot. Best to park in the front lot. No need to ask.