Gologit, good for you for sending him packing. Lucky for him that he didn't kill the driver or have to pay for the damage. Like I said my experience has been with smaller stuff; I have seen the mixed results as well. I can't explain the different behaviors. I once put a chain in the middle seats of my old Land Cruiser after it had already went through the tempered back glass and left multiple link indentations in the tailgate. No jerking involved - just slowly pulling a chain free from some bundles of re-bar that I had just pulled off the side of a semi-trailer. I have yet to witness the launched trailer ball from a recovery strap but I don't doubt that they are deadly. I have learned to look for stout attachment points, to pre-load things when using chains, tow straps, stiff ropes and cables, to be real careful with momentum recovery straps and ropes, and to stay as clear as possible. Ron