A converter dolly has its own:
a.Engine and transmission
b.Air tank, frame, one or more axles, and fifth wheel
c.Fuel tank and electrical generator
d.Cab and steering wheel
Explanation
A converter dolly consists of a frame, one or more axles with wheels, an air tank, a fifth wheel coupling on top to connect to the trailer above it, and a drawbar with a ring hitch to connect to the pintle hook on the trailer in front.