When uncoupling the converter dolly from the lead trailer:
Correct. Standard sequence: support the trailer (landing gear if it is a semi-trailer), disconnect lines, remove chains, release pintle hook.
CDL Practice Question #373
Category: Doubles/Triples
Why this question matters
This question is one of 50 in our Doubles/Triples bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.