If memory serves me well..the frame of the Dodge van was integrated in the floor of the vehicle..making the frame a softer material than the full frame of the ford.how i remember this..they were a pain to raise on the single post lift.if we did not have the lift supports under the reinforced areas the frame would give making creases in it along with the driveshaft hitting the base of the lift causing it to bend under the weight of the vehicle.