I have seen those long swim noodles used to support the slide topper. They taped three of them together in a pyramid formation and slid them under the topper. I tried making a ridgepole from PVC pipe, but it still allowed water to sit on top of the topper. The ridgepole was 9 feet long and the topper was 14' 6'' long, so that may have been the problem. I'm going to make it longer to see if that helps.
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