The only topper that gathers water is my large long one. If the wind is blowing it will usually dry off pretty quickly. Occasionally I will get my ladder out to release a little tension on it to drain some off. For the most part we don’t notice much flapping. I’m grateful I don’t have to get on the roof each time I camp under a tree to make sure the slide tops are clean.
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Tom
2019 Alpine 3651RL
2016 F350 CC DRW
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