What should be referred to when determining if a vehicle's cube limitations have been exceeded before tying down a load?

Answer: B — Vehicle data plate

The vehicle data plate is an essential resource for determining whether a vehicle's cube limitations have been exceeded. This plate provides critical information specific to the vehicle, including its maximum weight capacity, load distribution requirements, and other vital specifications. By consulting the vehicle data plate, operators can accurately assess whether the load they are planning to tie down falls within the permissible limits of the vehicle's design. This ensures safe handling and operation, as exceeding these limitations can lead to safety hazards, equipment damage, and operational inefficiencies. In contrast, while the owner's manual and manufacturer's specifications can offer general guidance about vehicle operations and capabilities, they may not provide precise loading limits specific to the cube requirements for that vehicle at that moment. The load distribution chart, while helpful for understanding how to distribute weight, does not typically address the total volume or cube limitations directly. Thus, the most reliable and immediate source for cube limitations is the vehicle data plate.