Im curious how strong the wind was?
If you use the interstate you are driving in at least a self created 70MPH wind every time you drive. More if you are in a headwind.
Im not sure the wind you encountered caused your problem. Could you have kicked something up onto the belly of the camper while driving? Once the coreplast was loose the duct damage easily followed along with the air pulling at it when it was exposed.
2012 Wildcat Sterling 32RL, Gladiator Qr35 ST235/85R16 Load rating G, TST 507 TPMS w/ Flow-thru Sensors & Repeater, Reese Sidewinder 16K Pin Box, PI EMS HW50C
2009 Chevy Silverado 2500HD CCSB LTZ Diesel, Fumoto Oil Drain Valve, Turbo Brake activated, 39 gal Aux Tank W/ Fuel Pump transfer, Air Lift Loadlifter 5000 air bags.