We make Maxum's factory OEM canvas, and definitely do NOT recommend towing (more than a block or two) with the canvas in place. You risk damage from wind, stones and road oil/grime. Eisenglass is easily damaged by oils and grit.
In fact, most boat manufacturers do not recommend having the bimini top up over 45mph.
I know its troublesome to take down the canvas every trip, but your canvas will last much longer this way.
Happy boating!
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Captain Ross, RNR-Marine ________________________________________
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