We've stayed at a bunch of Walmarts along I-95. The White Marsh, MD Walmart has a huge parking lot. Have never had another camper there when we've been there, but there have been tractor trailers. It's a few miles from I-95/I-695 and it is quiet. We've also stayed at the Florence, SC Walmart, the Lumberton, NC Walmart (this one can get noisy) and the Pooler, GA Walmart.
I'm probably missing one or two, but in any case, at all of the ones we've stayed at, we've never had a problem. All of them, except the White Marsh, MD Walmart have security that patrols all night long. We don't like Flying Js because they are too crowded and usually RVs are right on top of each other.
If you prefer Campgrounds instead of parking lots, the KOAs in VA and NC are really nice. We've also stayed at the Florence RV Resort in Florence, SC and the Jacksonville North (Kingsland, GA) KOA which is descent.
-Michael
Michael Girardo
2017 Jayco Jayflight Bungalow 40BHQS Destination Trailer
2009 Jayco Greyhawk 31FS Class C Motorhome (previously owned)
2006 Rockwood Roo 233 Hybrid Travel Trailer (previously owned)
1995 Jayco Eagle 12KB pop-up (previously owned)