A "drive-axle skid" on a doubles rig:
Correct. A drive-axle skid leads to tractor jackknife. With trailers behind, the situation gets worse fast — the rear trailers can swing wildly.
CDL Practice Question #370
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.