My grandpa owns some property that he always use to mow down with a bush hog 2x a year and it took about 15 hours with a 24" deck on the bush hog to do it. He has had a stoke and is no longer able to do it. I have thought about doing it. Would it be best to use a) his bush hog 24". b) 48" belt walk behind 12.5hp. c) super z 60" 27hp. Its not extremely rough but its def. more so than a lawn, because it is a field. I don't want to tear about the ztr but if it take it slow it might be ok. The downside is there is poison ivy all over. What would I do with the mower after it has been though the poison ivy? How long will the oil last before it won't effect your skin?