For those with 4 kids in car seats what cars did you find work the best? I have a 5 year old in a booster and 3 year old twins in 0-4 forward facing seats, and potentially a newborn. We currently have a 5 seater Holden Astra which won't be big enough. I am thinking ford territory or Hyundai Santa Fe 7 seater or a Kia carnival??