What could happen if you fail to perform a tug test after coupling?
a.The electrical cord may not work
b.The trailer could separate from the tractor while driving if the fifth wheel did not lock properly
c.The landing gear might not retract
d.The trailer brakes will not release
Explanation
Failing to perform a tug test could result in the trailer separating from the tractor while driving. The tug test verifies that the fifth wheel locking jaws have fully engaged around the kingpin. This is a critical safety step.