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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Doubles and Triples Practice Test
Question 1 of 3
When you're connecting a converter dolly to a third trailer the trailer height is correct when which of the following is true?
A
The fifth wheel is touching the trailer
B
The kingpin is lined up with the coupling assembly
C
The trailer will raise slightly when the dolly is under it
D
The trailer will lower slightly when the dolly is under it
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