I rented a John Deere skid-steer (Bobcat) with a hydraulic driven bush hog mower for a project one time and it did work well for the smaller stuff. I have a Cat skid-steer on rubber tracks and had considered buying a bush hog for the front, but with all the granite we have here in the shield, I knew the rubber tracks would not hold up to running trails with it (it costs $6000 to replace them), so I ended up buying the largest model of these rough cut mowers
http://kunzeng.com/acrease-rough-productpage.htm instead. I have pulled this mower behind my 4-wheeler for 8 years with just sharpening the blades on occasion, it is still going strong.
We took our flying club's PA12 fishing Saturday, every time I do that I get the fever to put the185 on skis, then I think about getting that heavy thing stuck in the slush, it would be nice to have an option to land on a strip when the lakes are bad...float season is coming.
Steve