Knarr security has come up several times. People want to live as a pirate/sailor without worrying about somebody easily stealing all their stuff. The new credo system could make this a reality without making knarrs OP for everyone.
Stealing from a nomad's knarr should require you to board first, not only leaving a theft scent but also requiring you to siege the knarr(which could be performed without siege machines and have much less shield than a village) . Stealing containers should cause shp damage per item the same way a stockpile would. I don't' know anything about wagon mechanics but I think they should be similar.
Or maybe nomad credo could stay the way it is but unlock a new "pirate" or "sailor" credo and "pioneer" for wagons or something...
Maybe using a knarr to siege another knarr could give a siege bonus, and the amount of people sieging would effect it as usual.
Maybe the "pirate" credo could also make it easier to siege other pirates.