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CDL · Pulling Doubles and Triples

How should you back a doubles combination?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Backing a double requires unique skill — most experts recommend avoiding it; if backing is needed, uncouple to a single first if practical

  1. A Backing a double requires unique skill — most experts recommend avoiding it; if backing is needed, uncouple to a single first if practical
  2. B Use only the steering wheel
  3. C Always at high speed
  4. D Just like a single trailer

Why this is the answer

Backing a doubles combination is exceptionally difficult because both trailers pivot independently on the dolly. The geometry creates oscillation that is hard to control, and inputs at the tractor produce delayed and amplified responses at the rear trailer. The professional consensus: avoid backing doubles whenever possible. Plan routes and stops so that pull-through or straightforward forward maneuvering is possible. If you must back the combination, use a spotter, move very slowly, and recognize that any significant angle between the trailers may require uncoupling to recover. Many drivers will uncouple the dolly and rear trailer, back the lead trailer alone, and then re-couple.
Source: FMCSA CDL Manual 7.1.6 Backing

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About this topic: Pulling Doubles and Triples

Pulling doubles and triples means managing the most unstable combination on the road: the rear trailer whips, rolls and jackknifes more easily, following distance must grow, and the sequence of air-line and brake checks is longer. These questions cover the handling rules specific to multiple trailers. This is one of 29 Doubles and Triples questions on pulling doubles and triples, each with a full explanation on a single study page.

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