What type of soil do you have?
If it's clay type mud, than I've found tall, skinny tires work better than big ones. Large tires, though they have less psi on the ground, also cake up really bad and become giant balloons with no traction.
The larger the cleats on the tire also make a huge difference in mud. R1's cut right through it, while R4's tend to bog up and don't clean as well.
If you're on pasture with grass, than I agree with the wider tire theory of floating the tires across it.
Of course, there is not ideal situation or perfect way to get through mud. Usually the better the set up you have, the more stuck you will get!!!! Your two wheel drive family car never gets so stuck that you need to spend hours and hours using winches to get it unstuck, but with a 4X4 and lots of power, it's real easy to get into those situations. /forums/images/graemlins/grin.gif
I know this from personal experience. The better I think I am at getting through something, the more likely I am to try it. /forums/images/graemlins/shocked.gif The results aren't always pretty. /forums/images/graemlins/frown.gif
Eddie