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I found this interesting...
Posted on a news group was a question of why an air conditioner was leaking on the INSIDE of the RV. Several of us replied that the unit must have a bad seal since the condensation should drain onto the roof. As it turns out, someone had run a bead of caulking around the outside of the AC unit to prevent water from dripping onto the roof. In the process, they blocked the drain holes and the water had nowhere to go but in.
So remember, your roof AC unit should drain water onto the roof. Don't try and seal it there or you defeat the design of the unit.