According to the license the driver is not allowed to have any of the personal items in the car. If he will be stopped at the weigh station and the police will find any personal items in your car the driver will get a 500$ ticket. But the reality is people need to ship their personal items along with the vehicle. You can put up to 100 pounds of your personal items in the trunk or inside the car but below window level and make sure its properly secured and it will be 50$. But still, it will be cheaper rather than sending it separately.