You speak of steep slopes, and you question stability of a larger tractor compared to a SCUT. I have a photo of my yard attached for you to ponder.
I cut 3 acres of this slope, I started out buying a SCUT (Kubota
BX25D) and found it to be inherently dangerous and deadly even with filled tires. If you stepped on the downhill side of the floor board the machine would start to tip. With my backhoe on, I had no choice at all but to swing it to the uphill side and drive real slow. Overall, it was MUCH less stable than my garden tractors. As in, I dumped that thing on Craigslist within 4 months of buying it. Not just no.... HECK NO!
I went from that to a Kubota
B2650 that I had built specifically to live and work on my property. I had it built with wider tires than standard, spacers added, 400+ lbs of fluid added to each rear tire. My
B2650 is massive compared to that SCUT. It is much wider (61"), much longer and much taller. But... it is much heavier as well with those fluid filled tires that are 4 times larger/heavier.
The stability of the
B2650 compared to that SCUT is night and day improved. Do not get in your head that a SCUT is stable. I found it to be the most insanely dangerous and unstable thing I have ever driven on this land.