We are expecting baby #4 and debating upgrading our vehicle. Kids are 7, 4, and 2, so we will have 1 ff harnessed and 3 rf once the baby arrives. We will need this setup for about the next year or so then we will switch to 1 boostered, 1 ff, and 2 rf. What is the best for 4 carseats? Convenience and ease of getting everyone in and out multiple times a day is very important so wondering what the best option would be for us those things considered!