We just got a 2008 Caravan with a middle bench instead of the 2 captains seats. I've found the captain seats online and am curious if anyone has ever taken out their bench and put in the captains seats. We like the bench for now (it has built-in child seats with 5 point harness), but I was thinking about getting the captains seats for when the kids are past the car seat stage. Do I need the "floorplate?" How difficult is it?