Slide toppers can flap in the wind...depending on the orientation of the wind to the front or back opening of the topper. Takes a good wind to do it. It's not like a flag cracking in a strong wind and not hard to let the brain tune it out.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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