I had the same setup on one of my trailers on a old boat just take the setup you have on now off since brakes do not work any how. Buy a new coupler and bolt it to the trailer frame I did add electric brakes to it also easy to do lowers it about 3 inches.

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8 mins ago

I roughly measured the tubes to fall somewhere between 20" and 24". The boat also has cones on the back of the tubes (starting about where most tubes normally end) that should give some added flotation to the back. They are basically sponsons.

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