Question:
A converter dolly is used _________.
A
To couple a second (or third) trailer behind another trailer.
explanation
Couple tractor and first semitrailer as described earlier:
A converter gear or dolly is a coupling device of one or
two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming
a double bottom rig.
(According to CDL Handbook)
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