I don't carry them. I'm not sure how well they work in mud. I've usually heard of using them more for snow and ice.
A good aggressive tread, a locker or limited slip, a sand ladder, hi lift and winch are more along the lines of what I would suggest.
Having said that, the Jeep runs BFG ATs, Rear Detroit, Front Limited Slip, Hi lift and Winch.
The truck, BFT ATs, rear limited slip, open front. Eventually I would like to outfit the truck with offroad front and rear bumpers, sliders, hi - lift and perhaps a winch. I don't usually take it anywhere that I've need the others yet, but it is nice to have to increase the safety margin.
Something else that I forgot to mention is suspension. A flexible suspension goes a long way to helping you keep traction as well. Flexible enough to move over obstacles and keep traction, but no so flexible that it keeps you from getting power to the ground in mud etc.
Kyle