2.3.1 Particular care should be taken to distribute
forces as evenly as practicable between the cargo securing devices.
If this is not feasible, the arrangements should be upgraded accordingly.
2.3.2 If, due to the complex structure of a securing
arrangement or other circumstances, the person in charge is unable
to assess the suitability of the arrangement from experience and knowledge
of good seamanship, the arrangement should be verified by using an
acceptable calculation method.