I can relate to your fixation with turning radius. I keep an old, tricycle-front tractor (Allis Chalmers model C) specifically for the purpose of skidding logs out of my woodlot. With break assist, that tractor actually does turn on a dime. Unmatched manuverability, and far superior forward visibility, make it much easier to drive thru the congested woods than a wide-front tractor. With those, the front tires often block your view of stumps etc.. Finally, the damage it causes to the soft forest floor, while skidding logs, is much less than occurs from a wide-front, 4wd tractor. Getting the steering tires out of the same track as the drive tires makes for a much softer footprint. This style tractor is obviously not a stable as a wide-front on hills, and the over-abundance of lawsuits and lawyers we have here in America these days have prevented it's manufacture for many years. These days, flat-landers like myself are stuck with antiques if they want the best skidding tractors, designed back in the day when common sense trumped fear of lawsuits. I still see some folks using those old trikes with belly mowers, sort of the original ZTM. The biggest issue with the old trikes, being mostly tall "row-crop" models, is difficulty getting on and off. I welded up a little step, and bolted it below the operator platform to make that easier on mine.