I dont see how it works. I am sure its just because my mind isnt getting it. If you are spooling the winch in then the vehicle would seem to have to move forward on the winch line regardless of how many snatch blocks are on the rear.
If the winch line were moving directly to the side, instead of attaching to an anchor point directly in front, I could see how it would work, but minimally.
For those who know how to do it I would like to see a video of it being done, so that I can learn too.
EDIT: Maybe I am starting to get it, the more I think about it. I would still like to see a video though, it would help out alot.