I have the same problem with a 2015 ACE 29.2. The water is running down the face of the slide wall and behind the bottom trim piece. This wraps under the flooring system and directs the water into the coach. The fix for the water entry was easy enough, I removed all of the silicone caulk the previous owner had put on and recaulked with Proflex. The trim was missing about half of the screws so I have added those where it appears they were never installed by the manufacturer and replaced a few more that were quite rusty. The last problem I am left with is that the floor system is made with a 1/8" lauan board covered in a plastic mesh that is bonded to the underside of the steel frame. This has disintegrated under the trim rail in the back corner from the moisture (4" x6" area) and I am not sure what to do about fixing this????
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