What's your budget look like? Centralia Illinois is fairly flat (mon-mountainous) and non marshy/sandy on average, correct? If so, I'd prefer tires to tracks. Is 36" a must?
The Thomas has the best controls of any mini skid I've ran. For the price of the Thomas, it's hard to go wrong for your first mini. You could recoup most of your investment after running it for a year or two. The Thomas is ~39" wide with stock tires/wheels. In nearly 4 years of owning mine, I've not had a job the width made me hand drag.
If I were buying new, I'd get a Boxer 427W and put Thomas controls in it.
If I had to go through a 36" gate, and wanted to buy new, I'd get a 500 series Boxer and put in Thomas controls.
I've not done it, but it's entirely possible to make a Thomas under 36" wide.
Bobcat specifically, they are a good machine with fair controls. They are a general nightmare to work on however. Get a sulky/chariot if you get one, walking behind is just silly.