On trucks, I find the bed area to be the most horrible, but that's bad, because the commonly accepted concept is that the rear third of the pan really doesn't make that much difference.
Yes, it does make sense to use both, one to limit airflow under the truck, the other to smooth what little bit still gets under there. They're complimentary.
An airdam is a good first mod, though.
Can't wait to see some pics.
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