There has been a lot of discussion about this on the forum. I suggest running caulking along the top edge of the bottom slide trim. I found that lacking in my Miramar. Water would run down the outside of the slide and seep into gaps along this trim. Then it would make its way under the slide and drip onto the floor. It did the same thing when the slide was open but simply drip onto the ground.
It took a lot of investigation to find the problem because it was a small amount of water and only happened under certain conditions such as wind driven rain or slight tilt to the RV.
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