Now that we have a simplified port rating system, here's a note about taxes. In general, the assumption is that each harbour has some sort of port authority or an official working for the local ruler. The port official will meet the oncoming ship either outside the port or upon it's mooring at a dock, to inspect the ship.
Passengers are likely to get screened.
At this point, money comes into play. Port authorities may require a week paid in advance, subject to reimbursement when the ship sets sails. The juicy part for those who run nations. My guess is that Minrothad and Five Shires ports are running at full capacity. Picture this then.