One of these days, I'm gonna put a tiltmeter on the lawn tractor. I'll finally find out if the ditch & the edges of the yard are as scary as I think they are.
As for the working tractors, the worst areas I've ever used them as far as tipping hazard have always been the relatively level areas. On a slope, I'm worrying about stability & I put a lot of effort into keeping track of what I'm driving over & what the tractor is doing. On the level areas, I bump into rocks, stumps, holes, small trees & occasionally...big trees.
(of course, as I've said before, my idea of the proper tools for harvesting runs along Husqvarna & Stihl lines. I aint no wheat farmer, that's for sure...)