You might notice that a unit where they put a person in FL is the same size as, for example, a unit of consumer goods, or whiskey. By my assessment (relative to Trent (probably about 1.8m tall, or 2, to round it up)), those units are about 2.5 meters long and 1 meter tall/wide. I doubt one could put a human being and all the life support inside that, even in Kusari. I doubt one could put 20 of those inside a Starflier. They would have more volume than a 3×3×5m cuboid, which is about as large as the Starflier itself (which has a cockpit, an engine, a fuel tank, a reactor, life support, air conditioning, an ash tray or two, etc). Now imagine 30 of those inside a Dromedary.
But, I suppose people can shrink things in Freelancer. They can tractor them in trough ship walls, at 1500m/s without inertia, and somehow even neatly pack them side by side.
Blame Daam K'Vosh, I suppose.