plus if your truck dies, and it won't start, then you have no winch. they will pull a hole out of the ground,but theres to many times when your stuck that your truck is dead for some reason or another.and your stuck without a winch.
i had a friend who had one and it would pick his truck up off the ground, he had a nylon stap on a big limb in his yard with a snatch block and we used it to pull motors or trucks up so we could put stands under it. he broke several shafts tho not the drive shaft to the wrench, the one that is the spool, it would break about 6 inches in, right before it gets to the spool.
but its to many situations where you can wind up without your winch, same thing with the ones that run off your power steerin pump if truck not running no winch....i'd go with the biggest electric winch i could afford and two super batteries !!