Today's physics lesson...
If you carry a long cable (or several tow straps you can link together) along with some way to attach said cable to something sturdy (or an old truck axle and 5 lb shop hammer), you don't even need a winch. Hook one end of the cable to your vehicle and the other to a tree (or the axle after you've pounded it in the ground), pulling the cable as tight as you can. Grab the middle of the cable and walk sideways as far as you can. You'll either move your vehicle or pull the tree out by the roots (I =did= say "sturdy".) Yes, it takes some time and effort, but it =will= work. This is how my h.s. math teacher told us how he did it on the 2 occasions he got stuck in a sandy wash. The other thing he told us was, "of course, it's a whole lot easier not to get stuck in the first place, so scout your route first." :B
Lyle