It could be simple as an improperly installed/seated slide seal or a slide that is out of adjustment. When looking at the slide from the outside while it is retracted does it appear that the slide is equally seated against the trailer, top to bottom and side to side? If there is a noticeable gap the slide could need adjusting.
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2017 Coachmen Catalina 283RKS
2018 Ford F250 Super Duty 6.2l CCSB
2010 Jayflight 28BHS (sold)
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