YIKES!!! scary subject there Jim.. I have never had a TT or Fiver come off but I did have a 22ft boat come off the hitch. Safety chains saved my a*#. Not a scratch on the TV or Boat. It happend on the freeway at 60mph I took my foot off the gas did not use the brakes and the whole thing swayed to a rather abrupt stop. Boat was swinging around like a balloon in the wind. It would swing to one side tires on one side would leave the ground then swing to the other side where the same thing would happen. Right while all this was happening I still had cars passing me on the left just like nothing was happening... Ah you got to love California drivers. But to answer your question yes safety chains saved me about 60K