Just my take, but any Clan military force would technically be considered part of the touman, no matter where they were.
If you mean "a bunch of merchants arming themselves with 'Mechs", then the Warrior Caste would be ... grumpy. Perogatives, that sort of thing. Reactions would be ... energetic.
If you mean "assigning a support force to protect the merchants", then - depending on the prestige of the mission - anything from some older or greener Warriors in second-line equipment, to clan Infantry & support vehicles from solahma units, would be put on detatched duty. Still formally part of the touman, but operating away from the formal galaxies/clusters as a whole.
That the sort of thing you're looking at?
W.