Auxiliary equipment (refrigeration, hydraulic lift gates) on the trailer:
Correct. Reefer units, lift gates, and other auxiliary equipment add weight and may shift CG. Inspect securement and check operation in pre-trip.
CDL Practice Question #211
Category: Combination Vehicles
Why this question matters
This question is one of 55 in our Combination Vehicles 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.