An excellent site with over 5000 places for overnight parking already exists. See Overnight RV Parking
It's just what it says, though. Places to park overnight, as opposed to campsites. Walmarts, Cracker Barrels, Cabella's stores, Roadside rest or picnic areas, that sort of thing.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL