Quoted from teekee:

I'm not sure about the older Caravans but I've used newer Caravans from 2011 on up to move 2 pins nicely. No need to remove heads. Just load the first one in the rear door and slide it up all the way to the front seats turning it as it goes. Have both side doors open which will make turning it easier until its nicely parallel up against the front seats. A nice thick piece of cardboard works great under the machine to help you slide it and to protect it. When the seats are stowed I think those Caravans have those exposed big steel brackets mounted in the floor... those things will damage the pin if you're not careful. Hope you're not a big guy since you may have to slide the front seats forward a bit more than normal. The second game just goes straight in the rear door and you should have plenty of room to fit some padding between the two games.
As long as Dodge hasn't changed them too much (don't think they have) over the years as far as cargo space the 2006 should work fine.