If original with their age and 145k my money is on the bags. Arnott Industries for replacements.

Jack up the side that has been leaking and crawl under, you'll see small cracks on the bottom folds I'm 99.9% sure. That would be where your leaks come from

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards