If you get the app "Gas Buddy" on your Iphone / Smartphone, it will help you locate gas stations very easy. Second, if you set the fuel search to "diesel" instead of gas, you'll find most places that accommodate diesel fuel fill ups, have larger and more convenient parking area, and access in and out. (Not always, but it does help). Pretty much, everywhere that sells diesel will also sell gas.
You can search for fuel stations by pulling up the map view. It positions your location and then shows where the fuel stations are in relation to where you are. It's also a great little app to use if you are just trying to find exactly where you are when traveling too.
Unless you are selecting fuel stations in the heart of most cities and towns, you will not have too much difficulty navigating your motor home. If you plan your fuel stops outside of most major towns, you'll have much better success for easy in-easy out service stations.