Gator you need big kahunas and a tractor with brush hog. The kahunnas are needed so that you will drive close enough to the edge on that slippery slope.
Gator my two cents, if you can afford the Self-Propelled models do it. Working on the slopes of the dam is a real workout manually.
By the way I'm short on kahunnas so I back my kubota down the slope foot on brake free wheeling with 4x4 and fwd granny gear engaged so I can dump the clutch and bail if the brakes start fading.