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CDL · General

What should a driver check about a sliding fifth wheel?

Correct answer

That it is properly positioned for the load (weight distribution) and securely LOCKED in place, with the locking pins fully engaged

  1. A Nothing
  2. B That it is properly positioned for the load (weight distribution) and securely LOCKED in place, with the locking pins fully engaged
  3. C Only the color
  4. D That it slides freely while driving

Why this is the answer

A SLIDING FIFTH WHEEL (one that can be moved forward/backward to adjust weight distribution over the axles) must be: properly POSITIONED for the load (to keep axle weights legal and balance the load); and securely LOCKED in place with the LOCKING PINS fully engaged. CDL combination. If a sliding fifth wheel is NOT locked, it could move while driving — shifting weight, affecting handling, and potentially causing loss of control or the trailer separating. POSITIONING affects axle weights (sliding forward puts more weight on the steer/drive axles; back puts more on the trailer axles) — adjusted to stay within legal weight limits. Always verify the locking pins are fully engaged and the fifth wheel won't slide. Knowing to check that a sliding fifth wheel is positioned correctly and locked is commonly tested.
Source: FMCSA CDL Manual — Combination, Sliding Fifth Wheel

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