The trade would be whatever the Shipmen could buy from the local lakeside communities. In Lucifer its noted that Ashland, WI, is now the "port of the north" replacing Duluth (And I'm guessing Thunder Bay but there must be a Canadian port visited by them too).
Furs are mentioned, I would also think there would be goods coming up the Mississippi from the KFS (Via independent traders), so add percussion caps, black powder, cotton and other manufactured goods.
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