I first mowed a friend's 18 acres of fallow field with my Gravely 8199G with a 50' deck and a Swisher 44" trail mower off to the side. Turns out the Gravely far outmowed the Swisher, which I finally left off. Round one to the fields, and a very sore back.
Round two. Ferris IS3000 61 commercial ZRT with full independent suspension, basically what I thought was the best "ZT" ride I could find. And it did handle the bumps pretty well, but there are other reasons I didn't do this more than one year also. The Ferris with a 25 Kawi is a beast, nothing slowed it down, or clogged it up, and I was often cutting 2-3 foot field grass, albeit slowly at times. But fancy suspension or not, by the end of the second day I had a soft collar on to take the pain out of my aching neck from all the bouncing around. Zero turns don't like to go slowly; very quickly I wished I had a steering wheel to hold on to.
The fields looked gorgeous, like a golf course, But WAY too hard on the operator.
And here's the real rub. With a garden tractor or a Zeroturn, you are at bugland ground zero. You've got field bugs jumping all over you and when the part you are mowing gets small, and the bugs get really concentrated in that section, it's like an explosion of bugs as you mow through, and some want to get really friendly.
So...Plan C. I bought a used Case IH compact tractor and will mow the field this year with a Land Pride 60 behind it. And while the cut may not be as perfect, the ride should be much better and I'll be far above the bugs while the major disturbance is behind me.
So, Got Bugs? think about a little elevation my friend. Good luck.