Rob,
Since I bought my tractor back in September, I have been collecting stumps. I have attached a picture of my burn pile before I lit it. There are about 20 stumps of various sizes in there (5 clusters of 3 or more and some singles) as well as some other wood debris. It took me all weekend to burn, but by Sunday evening all that was left was the small remnants of 2 stumps. I guess those will be the start of my new collection. There were some huge stumps in that pile. The only way I could move them was to push them up the road with the loader. I was able to tip them on end with my BH so they would rest against each other to burn better.
Greg