I'm having difficulty understanding this approval for LSDs. As I understand it, they allow a small amount of slip (i.e. limited) before they let go and you lose drive. So this is absolutely no help if you have one wheel off the ground.
They have their uses, for race tracks, etc, where a wheel can lose a bit of traction due to rubber on the road, or a sharp bend, but I don't see them as useful for an off-roader, or have I got it wrong?