King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge
Which trailer structure slides into the fifth wheel lock during coupling?
75%
Correct!
Incorrect!
The kingpin is a heavy steel pin welded to the underside of the trailer front apron. When backing the tractor under the trailer, the kingpin guides into the throat of the fifth wheel, where spring-loaded steel jaws lock it in place.
Which trailer structure slides into the fifth wheel lock during coupling?
The central landing gear crank rod
The heavy steel Kingpin cylinder
The structural trailer crossmembers
The sliding tandem locking pin
75%
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