Lawn mowers and steep hills don't work. A 14 year old girl drown last weekend here while cutting the side of a irrigation pond. The mower rolled knocking the wind out of her and she ended up in the pond. We have a couple every season. I am rethinking a job that has about a 9/12 pitch for next spring. Some jobs just aren't worth it. I have a neighbour who is in a wheelchair for life from rolling a John Deere on a small 6 foot hill three years ago.