It sounds like you have a leak somewhere that is letting water in. Maybe a tail light or clearance light? Regardless, the floor is going to need some patching/replacing. But finding the water intrusion will be priority one.
Welcome to the forum from Kansas City, MO! Glad you're here! I wish it was under better circumstances.
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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