I have a large embankment at one of my jobs. (Pictures to come later). I have been using an echo trimmer to do it. It takes about 3 hours and 4 tanks of gas to do both sides and around cedars planted on top. I have sprayed it with round-up but it comes back after about a month. It's too steep to cut with a riding mower but not too steep for a wheeled trimmer or self propelled mower. I have tried a high wheeled Toro self-propelled mower but the bank has too many bumps/holes. What would you use? I think something self propelled would work. How good are the DR trimmers and are they self propelled?