The trapped air question in the third image is an interesting one.
I would guess that the air under the typical pickup truck is messy as all heck, and you shouldn't worry about managing it "after the fact".
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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