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Thank you for the information! I remember riding in my parent's car in the 1950's (remember vent windows) and sticking my hand outside and trying the exact experiment that you described! What fun that was! My thought about the rear end of a pick-up was based upon my observation of semi-trucks in the rain, e.g., the "burbling effect" of rolling air; hence, trucks have taken to using large bubbles and or "trailer tails" to reduce drag. But your are right: a pickup is not a semi, and the drag issues are different. I will publish a video of my smoke test when done.
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