Place all bases you do not want to ressuply at priority 3 and the ones or one you want at priority 1

Feels like a workaround.

The selection to/from base should be implemented. I wished this feature long time ago.

the supply and the contents inside the vehicle inventory should also be taken into consideration

I can't agree more to this!

Indeed this makes sence. In reality, exiting car while gear is set will shut down the engine. Case closed.