Review on 🚗 Reese Towpower 7043100 2-1/2" Class II Interlock Starter Kit: A Reliable Towing Solution by Marlo Schlachter

I know it's probably a problem with the car receiver as I've had this problem before, but they put a stopper in the receiver so (probably their own) only a few Tow hitch receiver fit. It goes in, but the pin doesn't go in because it doesn't go deep enough. I have to cut it or grind the end so it goes in far enough to insert the pin. This will void the warranty and will likely make me more liable in the event of an accident. Why can't coupling manufacturers come together and make everything work together?