After you have eased pressure on the fifth wheel locking jaws, block (chock) the trailer wheels as a precaution even if you’re sure that the trailer brakes are set. Then lower the trailer landing gear until both supports touch the ground and pressure is released off the fifth wheel. Disconnect the air lines and electrical cable and secure them to the tractor. Finally, pull the fifth wheel release handle to unlock the fifth wheel jaws. At this point, you are ready to pull the tractor forward just enough so you can make sure that the landing gear is supporting the trailer.