When securing flattened or crushed cars on a vehicle with containment on 2 sides, how many tiedowns, at minimum, are required?

Option 3: Has containment walls on two sides that: Extend to the full height of the load. Block against cargo movement in the forward and rearward. Secures each stack of vehicles with a minimum of three tiedowns, each having a minimum WLL of 2,268 kg (5,000 lb.).