I’ve shared both those concerns as well but like you I’ve had no issues. I do remember thinking that the ball design on the hitch attachment seemed too good to be true but it does work. 1up does recommend checking the main bolt every month or so. After dealing with hitch pins for years I was happy to forego that with the 1up. I’ve had tires go flat while on the rack, and obviously less than ideal the bike was still secure enough, certainly something to be aware of though. I’ve still yet to see a better rack design.