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OK, recirculation bubble. I was not talking about those little vortex generators at all. Sorry for misleading people...
Aerohead has the right idea with his first picture, except that the top of the box is removed and the bubble sits in there, and also there needs to be a wing on top of the roof.
But I get Frank's point too; the devices are to compensate for the pickup being worse off in the first place, and may be pointless to apply to a wagon.
Interestingly, my Ram pickup is rated at 25mpg (highway) while the Volvo I am looking at is probably a bit worse, even though the Ram is a much larger and taller vehicle. I guess engine efficiency has gone up over the years.
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