Practice question

What is a safe uncoupling principle for a loaded semi-trailer?

  1. Park on firm level ground, secure the vehicle, lower landing gear, disconnect lines, and pull out slowly
  2. Uncouple on a steep shoulder without wheel blocks
  3. Pull the kingpin free before lowering landing gear
  4. Leave air and electrical lines stretched tight

Answer: A — Park on firm level ground, secure the vehicle, lower landing gear, disconnect lines, and pull out slowly

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