You're very lucky. My DH's BFF's DDad was struck by a tow wagon that wasn't attached properly to the truck towing it. When it hit (his wife was driving), it decapitated him. We don't drive behind tow hooks anymore. You just never know if it's hooked on properly, or if it comes loose.I was driving down 95 behind a dump truck in the left lane and a piece of what appeared to be lead pipe about 3 inches in diameter came flying out of it right at my Taurus. I was younger and following closer than I should have and didn't have time to try to swerve to the shoulder. Fortunately it did not come through my windshield and instead struck my front bumper in such a way that it made a perfect circular hole. My dad and I used lots of body fill for that one. No idea if it would have come right through my windshield if it would have killed me or what.
You're very lucky. My DH's BFF's DDad was struck by a tow wagon that wasn't attached properly to the truck towing it. When it hit (his wife was driving), it decapitated him. We don't drive behind tow hooks anymore. You just never know if it's hooked on properly, or if it comes loose.