Importing and Exporting Vehicle Units
Similar to how Vehicle Components can be reused, Vehicle Units can also be reused.
If a Vehicle has any dependent files, then swapping Vehicle Units will be disabled as that changes the Vehicle and Changelog. You will need to Save As and then swap the Vehicle Unit after.
You can swap Vehicle Units with the same button that Vehicle Components are swapped with. And next to that button you can export your Vehicle Unit explicitly.
Vehicle Units are stored individually under the Components Tab but you can also import Vehicle Units directly from Vehicle files if it is a one-off situation.
You can also create Vehicle Units by just adding in the Trailer or Truck as the first Vehicle Unit and saving then. When on a Rigid Truck or Prime Mover you will be asked if you want to save it as Vehicle Unit or Vehicle as Rigid Trucks can be a 'Vehicle' on their own.