What is being taught is that irrespective of class (I, IV or V SDCB) the operator when approaching a pick up or deposit point must stop the truck and apply the park brake. If he is picking a load from racks, h has to hoist, let off the park brake enter the pallet, apply the park brake, pick up the load, let off the park brake, reverse to clear the stack, apply the park brake, lower etc. This is just not real world and operaotrs should be taught to use the service brake to render the truck immobile during these operations.