Abstract: A system for use on vehicles having air bag suspension components to provide the operator an accurate reading of the weight of the load carried. Air bag inflation is controlled by a height control valve to maintain a load carrying platform of the vehicle a constant distance from a vehicle axle. Pressure changes in the air bags and a first conduit serving same are communicated to a transducer or the like by a second conduit. A readout device is located in the vehicle operator station. The readout device displays the weight of the load on the platform and is adapted for use with different-sized air bag components.

Abstract: An air/hydraulic scale for use on a truck or trailer and having frame mounted hydraulic cylinders with piston rods contactible with a vehicle axle. Fluid expelled from the cylinders actuates a load indicating displacement cylinder located adjacent the load cylinders. The piston rod assembly of each cylinder is automatically retracted at the end of a loading operation and prior to road travel of the vehicle.