I made the mistake of adding a mudhog with regular 30.5's on a 1460 years ago.  Within two days, I bought rice tires for the front drivers, made all the difference.

It was explained to me that a mud hog on the rear will do nothing unless you have traction on the front drivers.  All the fluid goes to spinning the front, nothing left to drive the rear, get traction to the front, and fluid is available to drive the rear tires. 

Made sense when I had the experience, but money was tight, and I thought it was best spent on the mudhog.  I learned that you spend money on the best traction tire combination on the front first, then try to guide and lift the rear.  Actually, the mud hog just keeps the rear end of the combine from dragging, in our conditions.

Later bought a set of tracks, they can't be beat in very adverse conditions, and the mud hog helps with steering and keeping the rear from dragging.  My tracks were 30" Gilbert and Riplo with rubber road pads, so I could at least cross a blacktop road without marking it.  Worst part about tracks (besides the initial expense) was having to load the combine on a cart for long-distance hauls, and the slower field speed.  Didn't own them long enough to experience repair problems, but they took a lot of strain off the final drives of the combine compared to cutting knee deep ruts like I did for the whole crop before I got them.