What is the best way to protect the King Pin from kids knocking them selves out and or cutting there heads. I don't want to spend o bunch of money on a stabilizer so what other options, I've used nood...
You could cut a length of PVC pipe slightly larger inside diameter than the king pin and about the same length as the height of your wear plate, then lower the king pin onto the pipe gently with the jacks, until the pipe is held upright over the king pin and standing on the ground.