How realistic is it to expect to fit 5 kids, (9) not in a booster, but would like her to be (7) in a HBTB (5) HBTB (4) Almost outgrown Grace Nautilus, 53 pounds and rapidly closing in on the top slots, will be moved to PWSG, and (1) MA65 FF, but would like to switch her RF into a 7 seater Sienna. AWD is much preferred as we live in a snowy area. There are currently in a 2008 Chevy Express 8 seater. Is the Sienna doable to you think? Thanks