i think the headquarter is for a guild, not for a traveling mercenery company. specially for one that only has 12 warriers.
wagon is more proper, to store your stuffs, and i heared that they will add it into the game in the future. hopefully they will permite the posibility to lose your wagon during the adventure at deadly dificulty, in certain situation such as an ungraceful retreat, and lose your equipments form the inventory along with the wagon.