Currently there is no seek shelter for Traders. I’ve installed towers along their route but I have to manually garrison them. It would be better to have a hotkey and have them automatically seek shelter, just like villagers do.
Additionally, when they are garrisoned they do not resume their route. You must send them to the market, even if they were making the return trip from the market right before they went into the tower. If they could automatically seek shelter then you could tell them to return to work and they would continue their route.
Additionally, there needs to be a hotkey to “Select all traders”.