Practice question

What is the proper height of a trailer when backing a tractor under it during coupling?

  1. Trailer should be 30 centimeters higher than the fifth wheel plate
  2. The trailer apron should be slightly lower than the center of the fifth wheel plate, so the fifth wheel lifts the trailer slightly as it slides under
  3. Trailer should rest directly on top of the tractor drive tyres
  4. Trailer should be hovering 1 meter off the ground on crane cables

Answer: B — The trailer apron should be slightly lower than the center of the fifth wheel plate, so the fifth wheel lifts the trailer slightly as it slides under

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