What weight must always be listed on a shipment's transportation document?

The correct choice is gross weight because it represents the total weight of the shipment, including the weight of the goods plus any packaging or containers. This measurement is essential for transportation and logistics as it directly impacts shipping costs, compliance with transportation regulations, and weight limits for vehicles.

Gross weight provides a complete picture of what is being shipped, which is crucial for carriers in calculating freight charges and for customs authorities to assess duties and taxes. Using net weight, which only accounts for the weight of the product itself without any packaging, does not give a full understanding of the total impact on logistics and shipping. Dimensional weight focuses on the volume of the package rather than the actual weight, and shipping weight can be ambiguous as it may refer to either the net or gross weight depending on the context.

Thus, listing the gross weight on transportation documents ensures clarity and consistency in shipping practices.