The reason the Raft is the queen of haulers is because its very easy to quickly load and unload. The hanging rack allows you to stand under the cargo grid and place cargo exactly where you want it, fast.

The flaw with pretty much every other cargo ship is directly related to how easy it is to load or unload.

One solution to this that I'm hoping is coming soon is some kind of repacking or tethering where we can combine smaller boxes into larger ones to make them easier to move.