Our preferred over night stop has been WalMart BUT Walmart is slowly banning RV/18 wheelers. We were in Mississippi a few weeks go and asked security after seeing the "no overnight parking" signs. We stayed there 3 years ago. He said they got a notice from Corporate last week (first week of June) telling them to post the signs.
We have an app (RV Parky) that's pretty good, it told us the MS visitor center allowed over night parking. We asked and they said "no slides, no jacks, generator is OK
enjoy yourself and welcome to Mississippi".
Last week we were in Colorado, evidently they haven't got the Walmart letter YET.
Our #2 spot is a truck stop, NOBODY cares, although you might
need to stop before 5 pm. Just be aware that you will hear the trucks running.
You'll probably get some comments telling you "if you can afford a MH then you can afford a few 1 niters... I told the couples in a Newmar, and Prevost they most be cheap, they just laughed and said..
Exit Interstate, pull into Walmart, push 1 button, watch tv, sleep
get up. push 1 button and get back on Interstate, sounds like we just saved an hour times 4 nights on this trip.