Before using stabilizer jacks, what component must operate properly on the fifth wheel?

The landing gear must operate properly before using stabilizer jacks on a fifth wheel because it is responsible for supporting the weight of the trailer when it is not attached to the tow vehicle. Proper landing gear ensures that the fifth wheel is stable and secure while parked, which is crucial for operating stabilizer jacks effectively. If the landing gear is not functioning correctly, it could lead to instability when the stabilizer jacks are deployed, potentially causing the trailer to shift or tip, leading to safety hazards.

The other components mentioned have their own functions, but they do not directly impact the stability of the fifth wheel while using stabilizer jacks. The tow hitch is primarily concerned with connecting the trailer to the towing vehicle, while the brake system is essential for safe stopping during travel. The generator powers electrical systems but is not involved in stabilizing the trailer. Therefore, ensuring that the landing gear operates properly is vital for the safe and effective use of stabilizer jacks.