First check
Direct answer
Check kingpin position, jaw lock, release handle, fifth wheel height, trailer apron contact, air/electrical lines, and tug test procedure. Use the current equipment manual, code book, employer procedure, and qualified supervision before applying this on live work.
How to use this answer
Read the answer once, then prove it by choosing an answer in a practice question before looking at the explanation. If the miss repeats, tag the domain as Coupling and drill a smaller set before returning to mixed practice.