I live kitty corner across town from the Meijer headquarters, so I kind of hang out in the land of many Meijer stores. That said--I have never taken note of RVs parked overnight in their lots. There are two Wal-Mart stores in the greater Grand Rapids area as well.
Their Customer Service page
might be a good place to start for asking the question.
2017 Cedar Creek 38CK Hathaway Edition
2015 Ford F-350 6.7 CC 4x4
Full-timing since 5/2/2016. Roam Sweet Home.
FROG Int'l Rallies: 2012, 2013, 2014, 2015, 2016