"harmonics" noise
A few years back, found a beauty...2005 Jamboree GT, 30 ft with only 2000 miles on it. Bought it from original owner and when driving home on freeway, thought someone was honking at me! Soon discove...
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My Winnebago View made a similarly speed-related hum which disappeared entirely when I removed the hub caps ("wheel simulators") and left them in the garage.
