We've done 2 months in ours and as you know you are outside of the unit most of the time. These B's tend to fill up very quickly if you don't have a system worked out. As far as a car you can either pack up and use your B when you need to go somewhere, rent a car, or tow a car, that is up to you. We have tried all 3 and preferred the towing. We had a 35' A for a couple years and towing with a B is much easier than with an A especially when you get fuel, you don't need an escape route to get away from the pumps.
Nick
Nick