Land transport is the limiting part: you have to limit size to bridge heights and road width standards that are driven by how wide horse arses were in Roman times.
Loading them on boats is expensive because they are non-standard size, and large and flexible enough cranes aren’t available everywhere.
Finally, there aren’t boats of the right size, and those that are increasingly expensive. Airships are also faster (not by much, admittedly) and less sensitive to bad weather (not by much either) in particular waves.
Loading them on boats is expensive because they are non-standard size, and large and flexible enough cranes aren’t available everywhere.
Finally, there aren’t boats of the right size, and those that are increasingly expensive. Airships are also faster (not by much, admittedly) and less sensitive to bad weather (not by much either) in particular waves.