I have a 4 year old and a 6 month old. Before buying my wife a new expedition, we went everywhere in my 250 CC. The rear facing infant seat fits perfectly in the middle of the rear bench, and the booster seat fits well behind the driver's seat.

I have the driver's seat about 1/2 way back, and my daughter still can't quite reach it with her feet..

The CrewCab is the only way to go if you plan on hauling your family around!!!!