Freighters tend to sink being hit by one torpedo opening two (freight-) compartments. Often masts indicate the seperation section. Aim for the first or second forward mast and they sink more than often after a single hit. Additionally the forward drift seems to help drive them under.
Another good spot is the area around the fuel/coal bunk and the adjacent freight compartment. Well - again open two compartments.
Some freighters layout is slightly different and some seem to be well constructed. The tiny freight- and passenger ship is hard to sink for me.
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