I believe that when driving across a hill which is too steep often the front tires will lift off the ground just ever so slightly, once this happens the front end will slide downhill just a lil. Then, when the tires come back down of course they dig in, with a side load. If they hit hard and dig in hard, you begin a roll over.
I see debate about rear ballast and how much to use. I have heard folks say to use as much weight as possible. That is not right. You can have too much weight. Ballast is used to lighten up the front end, a counterweight for the FEL usually. But too much weight causes the front to get too light, on a hill this can be fatal. I say, when driving across a hill do not use any rear ballast.
I believe J-D has a "best weight" recommendation for each tractor. This is determined by engineers who spent many hours figuring out what is safest. I think it best to go with what they recommend.
I also believe the FEL is a good way to roll. I see folks mowing with loader buckets way high, one does this at a fast speed on hills. I cringe when I see her. Extremely dangerous. I always keep my bucket as low as possible, and go as slow as possible if near a hill. When near a hill I always have my hand on the stick, ready to drop the FEL instantly if needed. The loader bucket being wider than my front axle I figure I can gain some stability just by slamming it down if needed.
As FG said in another thread, anything different can cause disaster, mud, wet grass, rough ground, speed, weight distribution. It all comes into play here, and if it dont feel right dont do it, walk away, live to fight another day.
On a related note, a guy on CL was selling a tractor ( cat 2 hitch maybe?) anyway, he had this HUGE concrete weight on back which by his math weighed about 2500 LB's. WAY TOO MUCH!
Correct me if I'm wrong, I dont believe I am. Please move this if it can better help elsewhere. Thank you, Henry