Got a lot of loot to move? What you need is a seaworthy ship with lots of room for cargo: the knarr.
These were the workhorse ships of the Vikings (when they weren't looting and pillaging). These were the ships that sailed across the North Sea, the North Atlantic, up the Volga River....bringing trade goods, loot, slaves and settlers to and from everywhere the vikings went.
Here's a waterline model (a fairly big one: 16 inches long as printed, but you could always make it shorter) good for tons of loot, settlers, livestock, or anything else you want to cram in.
8 page pdf.
Here's the link:
Viking Knarr Cargo Ship.
Hope you like,