Abstract: The method for onboard vehicle weight measurement is provided for a tractor and trailer and also for a truck. A pressure sensor is installed on each airbag. A computer is fitted to the truck. Two computers are fitted to the tractor and trailer, respectively. A display is mounted within the cab. A converter is mounted to the cab. An air pressure value from each airbag with sensor is collected and transmitted to the computer or computers, respectively. Weight is computed for each airbag with sensor, each axle, trailer weight, tractor weight, combined tractor and trailer weight, and truck weight, and the weights sent to the converter. Signals are converted by the converter and conveyed to the display monitor for individual display.