I need to get a bigger 7 seater - I currently have a zafira but my kids are getting too big for it. So I am looking at the class of vehicles that include the Galaxy and the Sharan. What I need to know is, how good is the air flow in the back of these vehicles? When I do put DDs in the back seats of the Zafira, they struggle for air, and whinge that they don't get enough. I want to get a car that has air vents in the boot seats, and doesn't just rely on the air from the middle section of the car. Any comment greatly appreciated.