13. When visually checking a coupling device, you ...

2026 Free California DMV Double Endorsement Test 1

13. When visually checking a coupling device, you should:

Look for mud on the fifth wheel.

Make sure the kingpin is polished.

Make sure there is a space between the upper and lower fifth wheel.

Make sure the locking jaws are closed on the kingpin.

✔ Correct Answer:

Make sure the locking jaws are closed on the kingpin.

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