Currently I drive a GMC3500 15 passenger. I have 10 kids, so we have some extra space. The GMC is 12 years old so looking to replace it. We tow a large trailer (3 slides, sleeps 10). We've started to look at the NV but lack of extra space has me worried. I have 2 rear facing car seats, 2 forward facing seats and 2 boosters. Plus it's my daily van so shopping trip stuff. How is the seating when using all the seats? Is there really any space for stuff? And one everyone ask I'm sure has mileage I don't expect it to be good but close to my gmc). I don't like the sprinter style at all so till I saw these it was GMC only for my family since I need at lest 12 seats. Debating on giving up 3 seats. I wish this came in a 15 passenger version then I wouldn't question getting it.