Just because you mentioned being one-handed ...Do you know about sticky keys? It's a setting that allows you to 'hold down the Ctrl key' just by tapping it. It's a keyboard setting under Accessibility. You can also turn it on by tapping the Shift key...
https://copilotgps.com/en-us/CoPilot GPS is an app that works offline AND is RV aware. You enter your height, propane etc. and it will route you accordingly. It's not free like Google or Waze. The RV version is $30/year.
In Windows 10, MovieMaker is no more. Win10 comes with the app called Photos. Open the video clip there to edit it (it should be what happens by default if you double-click the video). Unfortunately, rotate is not an option for editing the video, BUT...
RE: casting to the TV vs using HDMI. Most unlimited data plan are only unlimited for data used on device ... On the phone. When you plug an HDMI cable to the TV you are still only using data on the phone -so far so good. When you "cast" to a smart TV...
If you're looking for a place to buy the Overdryve - I recommend TechnoRV.com. They are friends of ours and they have a good reputation for support.Rand McNally OverDryve 7 RV