It gets batted around here every now and then, though it's been a while.
I'm of the mind that any tractor can be tipped. The center of gravity is typically at least closer to the rear wheels which are wider in any event and, on anything but offsets like the Cub and Farmall A-s and 1xx's, is somewhere very near the center line of the tractor. All that is required to tip one over is for that point (the center of gravity) to cross outside an imaginary three- or four-sided box rising from a figure defined by the wheelbase.
The only tractors I believe are any tipper than another are the offsets, as their center of gravity is much closer to the left wheels than the right, so they will tip over to the left easier. (That could be from operating on too much of a sidehill, or from centripedal force of too fast of a hard right turn with the right brake locked -- as an acquaintance learned the hard way while showing off on a Cub) The common solution to that problem was to add weight to the right side to move the center of gravity in that direction, away from the left. That's why you'll see so many As, for example, with a stamped steel wheel on the left side, hard up against the transmission, and a much heavier cast steel wheel on the right, out at the end of the diff shaft housing. That extra weight on the right, along with the weight of the operator on that side, moves the center of gravity further to the right of the drive line, and away from the imaginary plane between the two left wheels, which would address the sidehill problem, and gives that extra weight some leverage to address the force issues of a hard right turn at too high a speed.
On narrow fronts, my imaginary box is triangular so, yes, it can be assumed that the center of gravity reahes that imaginary tipping point sooner than it would on the rectangle of a wide front. But on wide fronts there's another factor at work. There is typically a limit to how much the front will pivot. Once that limit is reached, the tractor is putting more of it's wieght on the side to which it's tipping, moving the center of gravity closer to that side, and closer to the side of the rectangular box.
In the end, plenty of both have been rolled, and I'd chalk most of them up to the operator, not the design.
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