We have 4 slides and one is about 12 foot. The large slide did flap when we first went on the road so I bought a roll of 1 inch nylon webbing and tossed it over the slide. This did two things, one it dropped the flapping to almost zero, it also gave the water a route to run off the slide. I added a quart water bottle on each end of the nylon to keep it from blowing away. Works nicely and doesn't put any strain on the awning. Dave and Betsy
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