I'm surprised you could pull the pin. If the tow vehicle is a tiny bit too far forward, or a tiny bit too far back, it puts pressure on the ball and the coupler can't release it. This same forward or back force is applied to the pin, so I would expect it to be hard to remove.
My wife and I can usually tell whether the tow vehicle is too far back or forward, simply by standing off to the side and eyeballing it. I crank up the tongue jack until it is lifting the hitch just a bit, then my wife tweaks the TV in the proper direction, and the ball usually drops right out.
I'm embarrassed to remember that in my early days of TMing, when the hitch wouldn't let go of the ball, I did indeed resort to a hammer or pry bar. And yes, I broke the hitch once. Now I'm older, a bit wiser, and I don't do that so much any more.
Bill
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