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When coupling a semi trailer to your tractor but you have not backed under, the trailer is at the right height when:
When coupling a semi trailer to your tractor but you have not backed under, the trailer is at the right height when:
  • The end of the kingpin is even with the top of the fifth wheel.
  • It is raised slightly when the tractor is backed under it.
  • The kingpin is about 1 1/4 inches above the fifth wheel.