[aerohead]

P.S.,I saw a minivan like yours at lunch.The front and rear wheels are not shielded at all from the airstream.The front airdam could be widened to just conceal the tires,and rocker panels could be extended at least 4-5 inches ( 100-125mm) to clean up flow along sides of the van( including behind rear wheels ).There may be kits available,don't know.Or make your own.