Google Earth is another application we use a lot.
You can search for "Walmart", "truckStop" etc and get their phone number listing and address for an area on the map. IE search for "Walmart near Dallas, TX."
Then zoom in to see the layout for entry and exit options.
Little known uses of Google Earth are to get directions and then right click on the route and select "elevations" and it gives you a chart showing trip elevations and grades along your route.
Also if we want to force a different unrecognized route weighpoint for our Garmin 760 Dezl we go to google earth, select the exact location, then enter the coordinates into the GPS as a location and bingo were good.
Unless it's a rest area or truck stop we always call ahead and ask for the manager and document their name of ok to park. Never an issue so far except areas of AZ and some cities with campgrounds in the city.
1999 Newmar Mountain Aire MADP 4080, Cummins ISC 8.3L, Allison, Spartan MM IFS, Howard Power Center, Chev Trailblazer LTZ Towed w/ BlueOx rigging, Segway X2.