I did tip my 55 hp Kama over but not all the way.
A part of my road goes through a ravine. Where the sheer wall goes up one side at about a 45° angle, there was a huge rut forming between that wall and the road. While doing maintenance on the road with a full fel, got the front tire caught in the huge rut and started to go over. The ROPS hit the 45° wall and I was stuck...tipped over, but not completely.
What I learned:
It happened slow motion and surprisingly, the pucker factor was not much more, (at first) than other side slopes I'd been on.
1) That tells me how dangerous side slopes can be before it's too late. It would be hard for me to discern when that point is, so I keep it as level as possible now.
I didn't panic but also did not do anything to counter the tip over....I couldn't think of what to do while I was tipping.
2) Fortunately, I had the presence of mind to immediately lower the fel which hit the side wall on the way down. Forcing the fel lower caused the tractor to straighten slightly. I put on the differential lock and back out while still forcing the fel down.
That move got me backed out of the ditch and straightened out again.
3) Now, I always wear my seat belt even when just driving on the road to my work area. You never know when you're going to need it.