The apron is the metal plate welded on the bottom of the trailer that gives the 5th wheel a smooth surface for vehicle connection. What should you check the apron for?

A That it is not bent, damaged, or cracked, has no illegal welds,and that it is securely mounted.

explanation

The apron itself should not be bent, cracked, or damaged. It will be welded to the bottom of the trailer, but it should not have welds on the surface that the 5th wheel contacts, and it should be securely mounted.