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Your truck is very similar to my extra/hauling truck. (2001 Chevy 2500HD 8.1L Big Block, Allison Transmission, 4x4.)
Stick some thin metal or heavy wire through the cells of the coroplast and that will stiffen it up quite a bit.
I am sure you have noticed the exhaust on these trucks is big, everywhere, and in the way. I would focus on putting belly pans between the frame and the steps first as that would probably be the easiest. I would also look at doing wheel tire air deflectors in front of the treads.
Also you can see the transmission crossmember hangs down below the frame about 2" for no reason. That can't be good for airflow down there. There are aftermarket flush ones available, or it wouldn't be that bad to fabricate.
Nice truck by the way, looks clean and taken care of.
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