Just incase this helps anyone get unstuck.
My lawn has been soaked this whole start of the season (western ny). I finally got the chance to cut the back few acres and got a little too ambitious trying to mow my little walking path into the back of my property. Got my zero turn stuck in some mud, attempted to bring my truck back but could quickly tell that would be stuck even worse. So this was what I came up with after some f bombs. 3x 8ft long 2x10s and my 3 ton jack. This honestly worked like a charm. I jacked up the mower from the lower back frame on the center 2x10, Slid the other ones under the tires over the mud, then back right up on to more firm ground. I don’t own a wheeler or a tractor so this was the best option. I’m going to keep these boards handy just for this reason in the future (or I’ll be smarter and check the ground lol)