OOC: Are the Weser and Werra navigable?
Can we retrieve the monies lost through reduced duties through increased taxes on the land, or through increased duties on other trade routes? I think that a landlocked country like Bavaria needs to get New World produce from somewhere.
Well, you could just do what they did in our timeline, pay through the nose to get the luxury goods you desire so much. You're welcome to try taxing the land more, and we'll see what the nobles have to say about that. This statement applies not just to you, but anyone in a similar position considering taxation of the public.
Also, I'll say if ships can go on rivers, which at this point, none of the available warships can.