Would be pretty easy to code too.
Make a travoise a mount template with high strength and agility to fit many items, but have movement points at 0 and of such a small size, it cannot be mounted by anything. Give it nosave subdue, so people would need to subdue it to carry it around. For some reason subduing doesnt seem to be affected by the weight of the subduee, so even a weak pc would be able to drag the travois around. Pack it, subdue it, move it, unpack it. Done deal.