That seems like a good way to go for unhitching, but I don't think it will work well with hitching unless everything is perfectly aligned. Yes, when I do it the TV comes up a few inches, otherwise you will not have enough slack to put the pin in. I saw a video where that was done, so I assumed it was fine to do so. It was fine for a while but now the ball moves up out of the collar very slightly, enough to pinch the pin so that it is unmovable. Hitching is definitely more fussy than unhitching! I did see the video for hitching that you mention. Thanks!
Carl