We just traveled 3,000 miles in our 99 Class-C Ford chassis Gulf Stream 26-ft w/ two slides; Road Noise was not an issues, so I would be looking at your slide wiper seals and storage position gaskets. We had an issue with our kitchen hood exhaust flapper rattling and found that running the exhaust fan was the easiest cure, but see online some options to replace where we can lock flapper down for travel. Of course, road surface and/ or tires maybe an influence also?
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