Sliding fifth wheel. Slide not damaged or parts missing. All locking pins present and locked in place. Check that fifth wheel is not so far forward that tractor frame will hit landing gear, or cab hit the trailer, during turns. Landing Gear Fully raised, no missing parts, not bent or otherwise damaged.
Crank handle in place and secured.
If power operated, no air or hydraulic leaks. Be sure air lines are supported and glad hands are properly connected. Make sure pintle hook is latched. Be sure light cords are firmly in sockets on trailers.