Rick, think about what the hook of the snach block is hooked to that you are trying to move. If you agree that you can pull 20,000lb with using a snach block you can't look past the fact that there will be 20,000lb on the snatch block hook. If you are pulling 20,000lb there will be a 20,000lb load on everything between the object and the winch vehicle. Of course you will have a 2 part line so each line will take half the load. Hooking as you described, there would be 10,000lb on the bumper (where the dead end is attached) and another 10,000lb on the winch (where the live end is attached).