As I said, it's not pretty.... ;)
You need a lot of cable to make it work as well as a minimum of 4x snatch blocks (the diagram shows 8x snatch blocks). You also need the trees to be in just the right place!!!
Thing is, if you've got access to that many snatch blocks, chances are, you've got another truck with you... You might as well get them to give you a tow.
FWIW - A shovel, hi-lift and sand ladders/waffle boards are by far the most effective for most situations. A long rope (and knowing how to use it) will also make a useful addition. If you're traveling with others, just make sure you've also got some shackles and some different length ropes (1m, 5m, 10m and maybe a 20m somewhere in the group).
M

