Real time monitoring and comparison of bucket payload and truck payload during a loading process allows calculation of material lost in transfer between the loader and the truck. The lost or spilled material represents increased costs due to additional trips of the loader to fully load trucks and also in non-value added worksite cleanup time. The payload monitoring system can not only evaluate the mass of material lost over a period of time but can also calculate the value of that lost material using real time commodity pricing. The period of time can range from a single bucket dump to a workshift or longer. Payload masses and/or calculated values may be communicated directly between vehicles or may be communicated in conjunction with a central station.