I have a Kubota L4240 44hp tractor and I am planning to buy a disc harrow. I am not a farmer and this is why I want to find out if a hydraulic towed disc harrow with 20 discs ( ie 5 discs per gang X 4 gangs) set at double raw of 18'' (46cm) discs with each raw of 10 discs set on one or more...