The water supports the entire weight of the vessel without limit. On land, there are limits to the weight you can have per axle, plus there are limits to the size and length of the vehicle.
It doesn’t make sense to build a city sized truck if you can’t drive it anywhere. On the water, you can have nearly unlimited sized vessels (look at ocean going tankers) you just won’t be able to dock in certain ports. That’s why larger vessels use smaller tenders or ferrys-to access ports they couldn’t normally reach.
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