I've got a lot of troubles with loading packages in / out of my ships, the Aurora is a mess, but you can still complete some quests, however, on a 300 series ship, it seems impossible to throw your box, to place it on a wing, or to mount the ladder with it... But today fellows, I've found how to place packages in your 300 series, allowing you to use these great ships in the actual version of the game. Simply land in upside down, cut the engines down and open the doors! However, mind the changing gravity orientation between your ship and the landing surface, I haven't had any issue with it but it might just happen.