You might experiment to see if you need all three of the bags of sand. I don’t have any technical knowledge but I can’t imagine that amount of weight (distributed a little so it’s not a point load) causing any structural problems.
My other concern would be to make sure the bags don’t rupture and end up with sand plugging the bow area bilge drain - you could probably clean it out but it’d be a mess to deal with.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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