The hard coated dock floats that are astronomically priced are only a good deterrence from muskrats. Beavers have gnawed right thru them many a time on Murray. Before the restriction put in place by SCE&G requiring these tubs we used to use the blue dow block foam and underlay the dock with sheet aluminum and strip the bottom with 2x4 runners to hold it in place. This isn't very cost effective either.
I've always wanted to find an old 16'-20' pontoon and flip it over to create a recessed floor between the toons and build from there.
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