I have been chasing the same problem. Just came in a little while ago, as it was raining here and perfect time to check. I think I narrowed it down a window seal above a storage compartment. Originally thought it was the seal at the compartment door, but after getting into the storage area from under the bed, I saw a drip above the door coming out of the wall, which means it's in between exterior and interior as you mentioned. Good luck with yours, and enjoy the Holidays!
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2016 Ram 3500 Laramie CC SRW 6.7 Cummins
2014 Jayco Jay Flight 28BHBE
Reese Dual Cam
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