After several years of very wet winters and summers our land is poached with a very clear 'pan'. What's the difference between with these and which is best? Can any be used behind a JD2140 (60 hp/cat 2)? We have a tine harrow and a pasture slitter but land is beyond these at the moment. As its probably something that needs to be done periodically it would be good if we could do inhouse - or is it one for contractor. land is generally sloping, some steep in parts.