One of the upcoming features currently being worked on is a new set of cart upgrades. These upgrades work differently to the existing set; rather than being a linear set of improvements, these parts will need to be discovered and then slotted onto the cart, allowing you to customise your trading vessel in various ways.
Have around 15 planned at the moment and I'd love to hear ideas for any others you'd like to see, comment here or in the discussion forums if you have any thoughts on must have cart upgrades!

