Many farmers in the upper midwest are scrambling to find ways to harvest in extreme mud. There's no easy way to do it, but along the way to finding how to best handle your fields-turned-swamps, here are some thoughts:
-install tow cables or chains to combines before you get stuck. Many combines have tow hooks on their rear frame or rear axle; whether or not those are suitable for un-sticking a stuck combine depends on how bad it's mired, how big the corn or bean head is, and other variables. Having a stout cable or tow chain already looped around front axles at the front corners and routed to the back of the machine ensures you're tugging on solid metal. Just be sure that the pre-rigged cables/chains don't rub/pull or kink any hydraulic lines or hoses when force is applied.
-I'll leave to experts the debate about whether tracks or "rice" tires or "logger" tires or LSW tires give better floatation. But I know for sure that if you install on your combine any tire.rim combination different from what was on it from the factory, you or someone from a dealership will have to re-calibrate the speedometer to give an accurate indication of ground speed. You may not care if your ground speed is accurate, but your yield monitor may use that signal to calculate acreage. Some systems use wheel speed/distance to calculate yields, some systems use GPS.
-don't forget the rear tires when trying to improve flotation. Some folks swear that larger diameter and wider rear tires help combine performance in mud as much as bigger front tires, because small rear tires simply sink out of sight in any ruts create by the front tires.
-if your combine is consistently wallowing through mud while harvesting soybeans, the amount the tires sink into the mud may change the cutterbar angle on the grain platform, causing the cutterbar to run heeled back. This may or may not affect calibration of the automatic header height control system.
-finally, consider trimming the bottom step off the ladder into the cab. When the combine wallows down into the mud, ladders often get jammed into the ground. At a minimum it will bend the bottom of the ladder. At worst, it will tweak the entire ladder and swinging landing, which sounds minor, but can be a costly repair.