Trailer Coupling Height Correctness Instruction

When is the trailer at the right height for coupling to a tractor?

a) The trailer is touching the ground
b) The trailer is higher than the fifth wheel
c) The trailer is lower than the fifth wheel
d) The trailer is at the same height as the fifth wheel

Final answer:

The trailer is at the right height for coupling to a tractor when it is higher than the fifth wheel.

Explanation:

When coupling a semi-trailer to a tractor, it is crucial to ensure that the trailer is positioned at the correct height. The trailer should be higher than the fifth wheel in order to effectively couple and prevent potential damage. By having the trailer elevated above the fifth wheel, it allows for a smooth and secure connection.

Lowering the tractor underneath the elevated trailer enables the kingpin to properly engage with the fifth wheel hitch on the trailer. This proper alignment is essential for a safe and reliable coupling, avoiding any harm to the tractor, trailer, or the coupling mechanism itself.