I am trying to figure out if I can get away with getting a car vs. a van on an upcoming vacation. My choices for a car would be Malibu, Grand Am, G6 or Monte Carlo. Carseats I have are (2) marathons, roundabout, snugride and a Nautilus. I also have 3 true fits but I think those are way too wide to make work in any combo with the other seats. Kids are 5yr old FF, 3yr old RF, 3mo old RF. Anyone have experience getting 3 into any of those cars with the seats I have available? Thanks!!!