Yeah used to go mudding and 4wheeling quite a bit when I was younger and lived out west.
Had a '79 Ford bronco that I built up. Rebuilt the motor for low end torque, put on a 6" superlift, 35" tires, locker in the rear, posi in the front, swapped in lower gear ratios (front and rear), and a lot of other misc stuff over a couple of years.
Had a great time doing it. Sold the ol girl couple of years ago here in Kansas. Last I heard the guy who bought it was entering it in mud competions and doing very well.
Now the only mudding I do is on county roads when I'm off hunting in the fall.