During a pre-trip inspection, how should the coupling system be checked?

Answer: B — Look for proper connection between the tractor and trailer, ensuring no gaps

The coupling system is a critical component for safely securing the trailer to the tractor. During a pre-trip inspection, checking for a proper connection between the tractor and trailer is vital. This involves ensuring that there are no gaps between the fifth wheel and the trailer's kingpin. A secure fit is essential for stability and safety while driving; any gaps could indicate an improper connection, which increases the risk of the trailer disconnecting while on the road. Additionally, examining the coupling system allows for the identification of other potential issues, such as wear or damage that could compromise the connection. A secure coupling helps prevent accidents and ensures that both the tractor and trailer function as a single vehicle during operation. The other options, while important for overall vehicle safety, do not directly assess the integrity of the coupling system.