I agree that BFG tires are what you should be looking in to. If this is a 4x4 that your driving every day & you just want to take it off in the mud with confidence...Here are the tires you should be looking in to. They were GREAT to me when I had them. I am actually going to be buying me a set come spring.
This is the A/T tires that I HAD & I loved them. Work better then you might think.
These are the M/T I want this spring. Probably just mount them on a different wheel. (just some cheap rally's or somethin) and keep them FOR mud days.
So really, if your looking for mud tires...those 2 are probably (In my opinion) the 2 best tires you can get for a daily driver/ mud truck.
Just because your able to drive these street without vibrating out of your seat. Best part being, they are NOT that salty. Good Luck. & don't forget that you can find some used tires as well, 80% tread or even less will still be great. Especially if your not mudding every day through 4 ft deep swamps. ((O_o)) Hope I helped a little.