The fenders and rear valance are double-walled.
Have you seen the route air takes in the Type III Notchback? In just below the backlight as on a Beetle, but then out to the sides, back through the fenders (where the Squareback picks it up) down to a plenum in the rear valance, and then forward into the engine.
That second one is the military replacement for the Type 181/Trekker/Thing.
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