A long shot here.... Possibly, your crank up and down roof vent isn't cranked shut all the way down. therefore the wind lifting the cover slightly up and down causing clunking sound.
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Bruce, Kansas
2016 Grey Wolf 26RR...100 nights camping since new
2006 Deluxe Harley Davidson
1993 Kawasaki KLR 650
1998 Polaris Sportsman 500 ATV
2004 f150 & 2008 f350 dually V-10
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