A steel coil weighing 21,000 lbs requires how much securement against forward movement?

The forward force (80% of the cargo weight) represents braking while driving straight ahead. The rearward force (50% of the cargo weight) represents vehicle acceleration or braking in reverse. The side-to-side or lateral force (50% of the cargo weight) represents traveling on a curve, ramp or changing lanes. The vertical force (20% of the cargo weight)) represents cargo vibration during transport. This requirement is satisfied when the cargo is "Fully Contained"