I have dropped a lot of trees, and I've been on the pulling end many times, too. I would be reluctant to use a winch, because they operate so slow. You can get tension on the tree, but once it starts to move, the object pulling has to move too, and keep the tree falling where you want it. Sometimes, the tree will go where you have directed it; sometimes, it needs continual direction. A winch can't deliver that. I'm not saying don't use what you have, and I may be wrong in how I think and approach the job. But, I would, if it were me, not rely soley on th winch. I would pull the line taunt, and once the tree starts to move, move the tractor back instead of reeling in the winch. The tractor will move fast enough to keep up with the fall of the tree.