I have a cat 931 good fir clearing as long as it's not huge trees there no way I would try it with anything with wheels.dip off in 1 hole while on a incline and say bye bye
You could think about finding a used tracked bulldozer on Craigslist. Harper makes tractors that are self leveling and made for mowing slopes. I think that they are pretty cool how the adjust to the slope:
You also might want to look at Ventrac. They are designed very low to the ground, and they can mow up a hill with a 30 degree slope. They have a 3point hitch, and I believe that there is a forum on here. What ever you get, make sure that you have a good ROPS/FOPS, and a seatbelt on.