i had a similar thing happen . i do not have marker lights , while going over a mountain pass 65-70 mph in a head wind 40-50 mph . plastic a-pillar covers started vibrating and making a hellatious amount of racket . i slowed to about 50 mph and noises stoped . with such a boxy shape seems like stuff wants to start sucking off when wind speed gets around 100 mph. (your speed plus head wind) just my observation . any one have any info on windtunnel results ?
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GREEN no BLING , LINE-X & 35's , Adv. , monsoon & some other crap too 
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