It's early proto type time. Using carboard and the Welder allows for a stable load, smaller foot print and bulk unload via a button press.

Its starts with a Jig /frame to set up carboard in a grid to then place the crates on that allows for 2 wide 5 long parcel of crates.
The parcel of 10 crates is then welded via a carboard block to the train.
Using a spud gun the load cardboard block is destroyed at the trade platform allowing the load to drop, starting the sensors to remove the delivered crates.

Welded crates allow for a rapid rerail. Which I will need to do lots of during track testing.