there a lot more stable than you think, I have used a lot like it in many sized bigger and smaller, never felt I was in trouble on normal grounds that is
as a fact, I actually like them over wide front ends for many things, smaller plots for one, as they turn so much tighter! making working in tighter spaces easier!
cannot say on what the HP is, but thinking its closer to 65-70 HP on this model, but I could be wrong!
I believe 90 to be correct but took some ones word for it and never looked any further into it. I will check on that...
I use it on fairly steep hill but never really pushed taking it horizontal on the hills. It turns on a dime which is nice in areas that are semi wooded but grass areas.