I don't really see a need for bigger! bigger! bigger! Perhaps the French Passenger ship Normandie of the 1930s/40s, or smaller WW2 era cargo ships, like Victory, Liberty, or T2 tanker vessels. If they bulk up on tugboats, they should use the classic NY Harbor tugs and put barge work in there, and not have vessels sink when they rub up against each other like in SS08. There have been HUNDREDS of times where vessels I worked on rubbed against another one of the same size with barely a mark made between them (helloooo barge work??)