Just to follow up on this thread. I finally finished the fencing project a couple months ago. I ended up not using a 3-point fence unroller/stretcher. With the amount of woods on our property I wouldn't have been able to use the tractor anyway - too many trees.
Now that the fence is "finished" the inevitable has already happened. Laying in bed last Sunday, almost asleep, my wife and I heard a big crash in the woods. Yep, a big pine fell right across our new fence. We'll have to splice in a new 50-60' section and stretch it to the nearest corner. It sucks, but with a fence running through woods there's no way to keep trees from falling on it from time to time. I figure replacing wire fencing is a lot cheaper than replacing wood or PVC fencing.