I have towed with this product for approximately 10,000 miles. The protective rubber flap that helps keep dirt out of the locking mechanism fell off after a few thousand miles of use, even when the flap was there it never quite stayed shut. On one occasion the locking portion shifted on its seat. I was not able to unlock until I was able to hammer the lock back on square to the shank. The lock is extremely susceptible to dirt, grime, road salt etc. Last time I removed the lock I had to soak the lock in penetrating oil and lightly heat pin with a torch, this was the only way I could get the key to turn.