I always tell anyone that asks to get the bigger vehicle, whatever it is. I’ve never complained about having too much space.
We’ve only got 2 kids, but have 2 large dogs, and routinely haul my parents or others as well. So there was no question or hesitation; Max was it. If there was a larger mass produced SUV we would have bought that instead.
Hauled wife and I plus 2 other couples on an adults only trip from MI to Gatlinburg, TN earlier this year. 11 hours each way, everyone was comfortable and had plenty of space. I did use a hitch mounted carrier though for wood.