As someone that often listens to audiobooks while driving, I don’t find problems with comprehension, unless there is something that is taking up a large portion of my attention. As long as I can basically drive on instinct and muscle memory, I remember it as well as if reading it. If there is something that I have to listen to, or read, then I generally either stop the book, or go back.
One strange effect for me though is that if within the next week or so, I hear a part of the book, I can tell you exactly where I was at that time, though I can’t generally go the other way, and think of where I was in a book when I was last at a location. The brain is pretty weird/cool.
Geography isn’t a problem. Skype can be used to get everyone “together.”