Haley FORGET THE duals!!!! Unless they are wide spaced duals they will just ball up with the sticky mud and be worthless. When you run wide spaced duals you usually have an eight row or larger head to allow for the extra width of the tires.
Put your 4wd on and replace the front tires with the same size but with Rice tire pattern.
Got family that live where the ground get real muddy every fall. They run 30.5 x 32 rice tires on the front and then 4 wd on the back. Then if it gets real wet they take the front tires off and install tracks.
I have had a 4wd on my combines for years. We do not get that muddy here but we do get slippery on the hill sides. I have ran many days when all the guys with 2wd set home because they could not stay on the side hills.
Also with the 4wd on many times you will not make hardly any track and in 2wd you cut ruts in the same field. I had the electric wire come off under the combine. I did not know it until I started spinning going right next to where I has just ran without a track.
I would be using this rainy time to get that 4 wd axle on the machine that runs the best.