When inspecting the king pin apron and king pin, what must be ensured?

When inspecting the king pin apron and king pin, it is essential to ensure that there are no illegal welds, that the connection does not show any gaps between the apron and skid plate, and that the system is secure. This is crucial because the king pin and apron are vital components that secure the tractor to the trailer. Illegal welds could indicate a compromised structural integrity, leading to potential safety hazards during operation. Ensuring there is no space between the apron and the skid plate is equally important, as a proper fit is necessary to maintain the stability of the trailer while it is being transported. Any gap could result in misalignment or even loss of connection between the truck and the trailer, which can lead to accidents. Therefore, confirming the integrity and security of the king pin assembly is a vital part of a thorough pre-trip inspection.