Had a trailer w/two slides and no toppers and would never be without them again. We've four slides on our Montana, all with toppers, and don't have that much wind noise. Unless you've over 20mph wind all the time, it's possible your toppers weren't installed with enough tension or the springs have relaxed.
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2010 Montana 3665RE, wet bolts, etc.
2006 Ford F350 Diesel Dually, air bags, Softopper, Aeroshild, etc.
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