My son Brian (29) made these stripes up and down this 45 degree slope today. He had to turn at the top! I just watched and shook my head in disbelief. He was using the 72" Toro Groundsmaster 4WD. It has enough difficulty just going side to side on this slope. To give an idea of the size of this damm, the lake is 25' deep. What are some of everyone else's difficult areas to mow?