An on-board load weighing system for determining the magnitude of the load carried by a tractor trailer truck is provided. The weighing system includes one or more load sensors that are placed between the load platform on which the load is applied and the suspension system of the truck/trailer....http://www.google.com/patents/US5814771?utm_source=gb-gplus-sharePatent US5814771 - On-board microprocessor controlled load weighing system