One reason for this specialisation is to make the greatest possible use of the volume available in the hull, as is the case with tankers, bulk carriers, car carriers, timber carriers etc.
Umzekelo omnye wubu buchule kukwenza ubuncinzi obulindelekileyo bomthamo okhoyo kwisiqu senqanawa, ngokweetanki, isithwali sambuku, izithwali moto, izithwali mithi njalo njalo.