I need some advice. I have an account that has a berm that leads into a drainage ditch, then gradually slopes back up on the other side about 3 feet. The main slope is about 7ft. tall at an angle between 60 and 70 degrees. The big downside is this is about .4 of a mile long. Can this safely be mowed with a large walk behind, a high wheel mower, or will it half to be done with string trimmers? I do have slopes near lakes that will justify the purchase of a wb mower if it can be safely used on the big slope. Can it be done or will I be spending a few long days with the trimmers? The other consideration is it only has to be cut 3-4 times a year per the agreement so it tends to be weeds, over grown grass, and bushes with burs on them. Your thoughts please.