My buddy just finished a custom bagger. Around 2010 ultra CVO. He put 26” wheel up frt lowered with air ride and stretched the bags about 9 inches further out the back. He was driving around 105mph crossing a high bridge over a river with a crosswind. The bike began to fishtail. Fortunately he recovered. My question is could all the modifications cause an updraft to make that happen? He had the rear axel checked about less that 1/4 inch out( that may be from fishtailing). Any theories? Thnx in advance!