I see what you mean, but you are talking of a covered craft, built or modified to be fully waterproof and cozy for a family. The cargo barges I have in mind (see the google link in my previous post) are much rougher day-to-day work affairs, with uncovered holds. A bit of undulation that comes above the gunwales and you're down the drink.
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Ceterum censeo, Carthago esse delendam.
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