What are the two listed ISO container handling capacities for four-high and five-high configurations?

• A. 77,000lb and 55,000lb
• B. 70,000lb and 50,000lb
• C. 50,000lb and 40,000lb
• D. 77,000lb and 60,000lb

Answer: (A)

In ISO container handling, lifting capacity depends on how high the load is stacked. Taller stacks create greater bending moments and stability challenges, so the safe lift decreases as height increases. The four-high configuration can lift up to 77,000 pounds, while the five-high configuration is limited to 55,000 pounds. This difference reflects the geometry and strength limits of the lifting system: adding a container on top reduces the safe capacity to maintain stability and prevent overloading. The other options don’t show the expected higher capacity for the shorter stack and the logically reduced capacity for the taller stack.