Payload monitoring device for a motor vehicle

A system for monitoring payload of a vehicle, wherein it comprises:

• at least one wireless transmitter comprising a piezo-resistive pressure sensor, a transceiver and a battery unit, encapsulated in an insulating casing, the at least one wireless transmitter being configured to be attached to an axle beam of the vehicle such that a mechanical strain of the axle beam is uniform and proportional to the payload, and the at least one wireless transmitter is further configured to emit a wireless signal in response to a mechanical strain of the axle beam, a wireless receiver configured to receive the wireless signal from the at least one wireless transmitter.