Practice question

Which sequence best summarizes safe uncoupling?

Leave the trailer unchocked on a grade
Disconnect lines before securing the trailer
Secure the trailer, lower landing gear on firm ground, disconnect lines, release the fifth wheel, and pull out slowly
Pull away before lowering the landing gear

Answer: C — Secure the trailer, lower landing gear on firm ground, disconnect lines, release the fifth wheel, and pull out slowly

The correct answer is shown above. Try the full quiz for additional practice.