For many types of trucks, knowing the loaded weight is important for operating safely and maximizing payload whilst avoiding fines for overloading. According to the complexity of in motion load weight calculation, our approach is more stable, inexpensive & good precision than other methods. In this solution, load weight calculated based on monitoring truck suspension changes with a matched sensor by vehicle suspension type mechanism. Then these data received by tracker device and send for server after combined with location and other truck status data.