I mow my small hill up and down now after a scare side hilling it! Side hill with a 50" deck I can make two swipes at it, vs many up and down travels. But...
The cub 128, Ariens GT17, cub 109, John Deere 110, and X570 will hang on with my butt on the fender. The sears, not much of a fender but with my butt hanging off the side it still went on 2 wheels and I quickly had to steer down hill awhile deciding if I wanted to jump off or not. Made it down safely...but never again. The previous owner of that tractor said his daughter roll it over on a hill when the tractor was only a few years old. It will also wheelie on flat ground if your foot slips on the clutch pedal, that was fun/scary at the same darn time.