Sounds right to me. Through the bottom of the truck is what I thought you were saying when referring to the "huge opening on the bottom".
I'd be curious to see a photo of what you're referring to.
Most cars have both an upper and lower grill opening. I don't know why they are designed to have 2 openings instead of a single larger one. Perhaps the division between the 2 increases air pressure and delivers higher density air?
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