I think they should add an NPC courier/caravan that delivers orders. Depending on how big the guild is and how much influence they have will determine their ability to transport and protect the delivery. So maybe you start off with a guy on foot, then he can get a horse, horse cart, and eventually guards that protect the caravan. Other players could attack the caravan and get alignment penalties just like anytime you attack other players. The NPC only delivers to other trade posts though so you need rights to use the trade post of course. I think it could increase player interactions and add life to the terrain with caravans traveling. You could even make the buyer pay "protection" fees to ensure a guard accompanies the transport.