If you have a smaller tractor and are looking for an offset slope mower, the Ferri ZME series may fit the bill. Ferri is one of the only manufacturers offering a slope mower in this size range in the North American market place.
The ZME uses an articulated Y-flail blade for a professional cut, and will handle brush up to 1" in diameter. In the offset position, the flail head can be lowered below horizontal, or raised to mow up an embankment. Designed to fit tractors in the 18 to 40 horsepower range equipped with a Category 1 hitch and dual remotes.