Why should a driver be cautious about backing a doubles combination, given the added complexity of two hinge points?
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Correct answer to question 107 (Doubles/Triples): Predicting how the trailers will move while backing becomes significantly harder with more than one pivot point
Why
With more than one hinge point between the tractor and the rearmost trailer, predicting how the trailers will move while backing becomes much more difficult, so backing a doubles combination requires extra caution and often should be avoided when possible.
Updated: November 2026
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