I have a Goldoni like that. On mine, you take the handlebars off, the trailer has its own steering wheel, throttle, clutch pedal, and a stick attaches to control the gearbox. After a year, I went back to Italy to buy another used Goldoni, because swapping the handlebars and trailer takes about an hour. It is my "pickup truck". My oldest son has been able to drive it since age six.
Someday, I'm going to mount a hydraulic pump to the pulley on the front of the motor, and a cylinder to lift the bed. Manually lifting it with a ton of dirt to dump isn't much fun (unless the load is carefully placed to be well balanced. Even then, there are times I need to drive forward to dump, and the bed wants to slam back down when empty)