Home › CDL Practice Tests › Combination Vehicles Questions › Question 42
Before pulling the fifth wheel release, what must be true about the trailer?
- A.It must have its doors open
- B.Its load must be unloaded first in all cases
- C.Its lights must be on
- D.It must be supported by its landing gear or otherwise prevented from falling or rolling
Correct answer
D. It must be supported by its landing gear or otherwise prevented from falling or rolling
Why
Once the jaws open, only the landing gear holds the front of the trailer. Releasing a trailer that is not supported drops it onto the ground or onto anyone underneath.
Manual topic: Combination Vehicles - Uncoupling · From the Combination Vehicles practice bank (CV-042).