Check the lower slide trim. Mine had no caulking there. It would seep in and slowly drop into the coach when the slide was in. It was doing it for a year before I was tilted one time, in a rain storm with the slides in. (parked in a truck stop) I got up to see how bad the storm was in the middle of the night and stepped in water coming from under the slide. Took a lot of investigation to find where it was coming in. If you extend the slide and run a garden hose right above that trim, you'll likely find water dripping from under the slide.
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