There are three main trailer statuses - Empty, Loading and Loaded.
In order to change the status of a trailer, click on it within the Yard.
A new window will appear, which will allow you to change the status of the trailer.
Once you select a status, click “Save”. Once the status is changed, the color of the trailer will also change. Trailer status colors and their meanings are reflected in the status legend at the top of the screen. You can view the overall count of trucks with certain statuses in the legend.