What must a driver verify during the visual coupling inspection after locking the fifth wheel around the semi-trailer kingpin?

1. Verify that the radio plays music
2. Verify that the fifth wheel locking jaws have completely closed around the kingpin shank, that the safety release handle is in the locked position, and that there is zero vertical daylight gap between the trailer apron and fifth wheel plate
3. Verify that the tires have zero air pressure
4. Verify that the trailer is unpainted