stu675:
Is it not a requirement that a driver is given a CMR which includes the weight of the goods?
In a word - “No”.
In rather a few more words, how can this possibly be done when a run involves both delivering and collecting stuff (either goods or empty pallets/stillages/cages etc). Bear in mind that the whole concept of CMR revolves around international transport by road - it has no significance at all as far as domestic routes are concerned.