AN instructor HAS to train drivers to load carry and drive trucks the correct way. Double stacking pallets is inherently dangerous even with a flat load smooth floors etc. The upper pallet can move and when cornering probably will, we occasionally find drivers on site doing this and one of 2 things always happens we either dismiss the driver or give them a final written warning you cant mess about with safety yes it costs more to do it right but safety on site shouldn't have a cost.
If you have to move 100 pallets over regularly I suggest you look at truck, operator numbers on site