Practice question

In a centre-axle trailer, how may the towing device move relative to the trailer?

  1. It may not move vertically with regard to the trailer
  2. It must be free to swing through a full circle in every plane
  3. It is locked solid in the horizontal plane but free vertically
  4. It is replaced by a fifth wheel and kingpin

Answer: A — It may not move vertically with regard to the trailer

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