It is my understanding that these compartments will never be completly dry. I have put on new weather stripping, re-alligned the doors, and adjusted the locks. They are dry most of the time but in heavy weather they take a beating. My solution was to use heavy plastic bags for everything we carry under there. This has an added benefit since the bags have handles I can reach things easier and pack it better.
Happy to have you with us.
1994 30' Excella 1000, Chummy III- Ford Excursion- 7.3 Turbo-diesel