If you could position the ROC is the back and never need to “leave the ship”, it might be useful.
that said, with the openness of the cargo, I wonder if things might get stolen when you are landed and moving towards a storage center, or if it might mean cargo can be damaged by someone shooting at it. So a shot penetrates the shields and hits the cargo of hydrogen. Does that mean you lose that piece of cargo? Since some cargo will need to be kept cold/warm/etc to prevent spoilage, does that mean this ship can’t carry that type of cargo?