Ecomodder's inflatable boattail concepts. Pfft. It seems that Ford went ahead a created an inflatable 'blocking' car perfect for really close drafting. Imagine your FE results!!!
Actually they are dynamic 'car' bodies used for their active crash avoidance & driver aids prototypes/programs. They are basically target practice for their sensors & monitors to create a database of optimum & safe speed/braking distances. The inflatable forms holds pretty well at speed.