I have some too during heavy rains. I noticed that the butyl seal was incomplete in that area around the door. I pressed in some butyl caulk and waiting for the next heavy rain. Note the gap was very small and it was only after very close examination I caught it.
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Brian
2016 RAM 3500 6.7L DRW
2018 Chaparral 360IBL, Andersen Ultimate II hitch
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