Typically, you can load about 10-14 yards of fill dirt on a dump truck.
However, not all car models comply with the above standards. To get an exact number, you need to determine the weight limit of this vehicle.
Theoretically, the truck's weight should be with the load capacity. It also means that a vehicle with a maximum capacity of 6.5 tons, the overall weight (including the vehicle and the moving material) will be 13 tons.