What will happen if the horizontal movement between the upper and lower fifth wheel halves exceeds 1/2 of an inch?

If the horizontal movement between the upper and lower fifth wheel halves exceeds 1/2 of an inch, the vehicle will be rejected or failed. This limit is in place to ensure safe coupling between the tractor and trailer. Proper alignment and minimal movement between these components are crucial for safe operation since excessive movement can indicate wear or misalignment that could lead to failure during operation. A secure connection ensures that the trailer is stable and reduces the risk of accidents, making it vital to adhere to these standards during inspections. If the movement is beyond the acceptable threshold, it's deemed unsafe, prompting the rejection of the vehicle until remedial actions are taken to correct the issue.