What should you do before coupling multiple trailers?

Before coupling multiple trailers, it is vital to inspect the coupling devices and ensure that all connections are secure and functioning properly. This step is essential for maintaining safety on the road. The coupling devices include the fifth wheel and the pintle hooks, which must be in good working condition to ensure the trailers are securely attached to one another. Any malfunction or improper connection can lead to trailer separation while driving, increasing the risk of accidents.

Additionally, checking the integrity of connections contributes to the overall stability and control of the entire rig during operation. Proper inspections help identify potential issues before they escalate, ensuring that the trailers can handle the weight load and are less likely to sway or become unbalanced while in motion.

The other options presented do not promote safety best practices. Attempting to save time by forgoing an inspection could lead to dire consequences if the trailers are not properly coupled. Checking load distribution is more crucial after coupling, and focusing solely on the brake systems does not cover all necessary aspects of safe coupling.