Some members wedge various types of inflatable balls, placed by getting on ladder, between the slide roof and the slide topper. If it is not your bedroom slideout topper that is making the noise, then you might try partially retracting the offending slide.
Other reasons why the topper may be flapping are stretched fabric and improper tension of the spring-loaded mechanism. If your topper is an older one, the fabric may have become stretched over the years.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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