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You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:

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

Answer :

Final answer:

The trailer is at the right height for coupling to a tractor when it is higher than the fifth wheel. This allows for effective coupling and prevents potential damage.

Explanation:

When coupling a semi-trailer to a tractor, it is important to make sure that the trailer is at the correct height. The trailer is at the right height when b) The trailer is higher than the fifth wheel. Having the trailer higher than the fifth wheel ensures that the trailer will effectively clear the fifth wheel during the actual coupling process. Lowering the tractor under the elevated trailer allows the kingpin to properly couple with the fifth wheel hitch on the trailer for a secure connection. It prevents potential damage to the tractor, trailer, or fifth wheel mechanism.

Learn more about Trailer Coupling here:

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