It is the driver responsibility to operate vehicles in a safe and legal manner. It is also the driver’s responsibility to see that the vehicle is not overweight.  If there is any question as to the weight, the driver will need to weigh the load, inform you, receive your approval to move, and later submit the weight ticket with weekly paperwork. However, it is your reasonability to help the driver to prevent any overweight, oversize violations. If no preventive actions were taken you will carry the responsibility as well.