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Pretty low center of gravity on that one...I would think it may be a little hard to roll that one unless turning hard on a hill?

Yep.  Only 8 inches ground clearance, but a smooth, solid steel belly pan with a couple access holes cut in it for oil drain, etc.  So, if you get "high-centered" just drive on off.  

I try not to turn much on hillsides, because when it articulates, it changes the wheelbase on each side. Turning upslope is not so bad, but turning downslope is touchy, as the downhill wheels move closer to together.  I mow at least 30 degree slopes going straight up and down, though.  Power Trac makes slope mowers that will operate on 40 and 45 degree slopes (different models), running dual wheels all around.