I have a leaky slide out on our 2015 Windsport. It occurred after about three years of use. The seal appears to be in great shape. It follows the contour of the roof and fits well against the roof. However, when it rains the awning above the slide out droops due to the weight of the rainwater. Water runs over the end of the awning, but some of it runs back under the awning and drops onto the top of the slide. I suspect that the rubber gasket could never seal a large flow of water, because there is very little pressure on the gasket to roof connection. The suggestion to tilt the RV slightly to encourage water to run away from the RV wall is a good one.
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