I think most of your questions have been answered already, but the one I didn't see answered was about the litter box when in the car. We have moved/traveled with our cats quite a bit, and I don't think the litter box has ever been necessary in the car. We even made a 9 hour move with Saphirah, and she didn't relieve herself until after we had arrived at our destination. (She had opportunity, but she didn't.)