A trailer jackknife, where the trailer's wheels lock up and the trailer swings around, is MOST likely to happen when the trailer is:
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Not quite.
Wrong. The AAMVA manual states a trailer jackknife is more likely when the trailer is empty or lightly loaded, not when it is loaded to maximum weight.
The correct answer is B: Empty or lightly loaded.
49 CFR 383.111(a)(15) (Skid control and recovery -- required knowledge topic); AAMVA CDL Manual
✓
Correct!
Correct. AAMVA Section 6.1.5 states that when trailer wheels lock up and the trailer swings around, "this is more likely to happen when the trailer is empty or lightly loaded." This type of skid is called a trailer jackknife.
49 CFR 383.111(a)(15) (Skid control and recovery -- required knowledge topic); AAMVA CDL Manual
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Not quite.
Wrong. Whether a trailer has spring brakes relates to how it is held in place while parked (Section 6.2.8), not to what makes a trailer jackknife more likely while braking.
The correct answer is B: Empty or lightly loaded.
49 CFR 383.111(a)(15) (Skid control and recovery -- required knowledge topic); AAMVA CDL Manual
✗
Not quite.
Wrong. A dolly converter connects an additional trailer in a doubles/triples combination; it is not the condition the manual links to increased trailer-jackknife risk. Load level is.
The correct answer is B: Empty or lightly loaded.
49 CFR 383.111(a)(15) (Skid control and recovery -- required knowledge topic); AAMVA CDL Manual