Does this walmart allow responsible truck drivers to park overnight on the property

Yes as long as you talk with management inside first you usually can park in back

I can't say that I recall Rigs parked in the main parking lot. There maybe an area in the back section behind the store. The facility is in located on a interesting site. Access is circuitous and not big Rig friendly, but obviously there is an established accessibility as it is a large store as most are.

Yes