I have slide out covers and if they get too full of rain I run mine in part way and they will drain off 99% of the water then return the slide out to fully extended. My particular model doesn't have a real big slide just little ones and they don't generally pool too much water in them. I would get into the habit of getting the water off there though. I don't think it would be wise to leave that kind of weight up on top of the slide out roof.
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