Truck and trailer have to be ALMOST directly in-line with each other
1. Once you have the trailer located and are ready to unhitch, (unhitching can only be accomplished when the truck
and trailer are aligned within 16 degrees of each other--see pg. 9), block the trailer wheels so it will not roll back or forward.
Back into the blocked trailer slightly and set the parking brake while you are still in gear. This action will relieve pressure on the lock mechanism before attempting to release the latch mechanism.
2. Lower the trailer jacks to the point of
just touching the ground but do not raise the trailer at this point.
3. Open the Lock Jaw Assembly by first lifting, then pulling the Release Handle towards you (see pg. 8).
4. Lower the trailer jacks until the bottom of the king pin box is almost free of the top of the Fifth Wheel Plate {A}.
Make certain that the bottom of the king pin is not so high that binding on the hitch Lock Catch would result.
5. After lowering the truck’s tail gate, disconnect the trailer electrical cord and break-away switch cable, then pull forward.
6. As the king pin slides from the Fifth Wheel Plate, notice that the locking mechanism remains open once the king pin is removed.
https://www.pullrite.com/sites/defau...20Manual_0.pdf