Hi K Jack,
There is, unfortunately, no possibility to make wakes for "Flying Cloud" or "Wachtaven II". This is explained fully in the introduction to the two super packs containing these vessels. If you go into My documents>shipsim2008userdata>custom missions, you will find a folder at the top left of your screen called "readme". click on that folder and you will find all the details of all the super packs listed there. The inland containership is listed under "Week 6". You will also find that the large bulker, "Selsey III" has the same problem. These ships were drawn from previous Static or AI vessels and it was apparently impossible to adapt them 100% to be player ships.