Question 1
Combination Vehicles
Question 1 of 3
When hooking up a tractor to a trailer, the trailer is at the proper height when:
The coupling surface of the trailer is just above the middle of the tractor fifth wheel
The trailer dolly wheels are just barely off the ground when fully extended
The coupling surface of the trailer is just below the middle of the tractor fifth wheel
The kingpin is just below the middle of the tractor fifth wheel