Do you have a skylon tower. Are you asking if they can be mounted down along the vertical sides of the tower? If so I can say I have seen it done before. Check out the new MB sports boats that come with the WS double up system factory installed. The 60's are mounted along the outside edges of the top bar and the 80's are mounted sideways along the vertical side bars. Have not heard any stories yet of problems but I know those 80's are heavy. Seems like the would see some pretty high stress if you hit a roller too hard
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