Remember, if you are pulling with any kind of rope except Dacron, you will be dealing with a lot of stretch. If something breaks, the rope will come right at you, so fast you can hardly see it.(Don't ask how I know this).
Put about 20 feet of chain about 3/8 size between your rope and the attachment point on the tractor. If the rope breaks, the chain will instantly drop on the ground and direct the rope down so it misses you. Otherwise, the rope will snap back and hit the attachment point on the tractor(and anything near it, like $150. grilles, or you) really hard.
When using a rope, if it stretches at all, especially nylon, always think where it will go if it snaps, and put in something like chain to deaden the recoil.