I am not a teacher.
Are you sure that you've copied this correctly? If you have it was written by a non-native because it's full of mistakes, and the punctuation is all over the place. No wonder you are having trouble understanding it.
e.g. 'pallet of any other similar article', 'may or may it not fit' and the entire last section from 'Containers and/or Cargo...' to the end.
Student or Learner