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What is a converter dolly?

A A coupling device that allows formation of a double bottom rig
Explaination
A converter 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 tractortrailer combination forming a double bottom rig.
B An electrical unit that changes current from AC do DC
C A converter that allows you to connect air lines to the trailer
D A coupling device to connect the trailer to the tractor