Most of the trade I have seen in previous games has been by single to small groups of traders. Some walked, these tended to be "tinkerers" who would move from little settlement to the next, plying their trade, swapping their talents for food, water, shelter, and other goodies.
Horse born trade was also prevalent. THese tended to be small groups, 5 - 6 people at most.
Depending on the state of the trails in the area, there were some horse and wagon traders.
My $0.02
Mike
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