You can find the industrial rated devices here Products and the non-industrial or recreational rated devices here Products
How many of you use these devices on your tractors? I know they have been mentioned before and I believe I have seen some on peoples tractors in pictures. I would guess that you should have two of them for both directions.
If you have one do you use the recreational or the industrial devices?
Do you use two of them or just one of them?
What is a good rule of thumb with regards to what degree is safest and where do you approach roll over? I am assuming that has a lot to do with the particular tractor, what kind of width you have on your rims and where the center of gravity is on that particular tractor. Do the manufacturers publish anything for each tractor? Of course maybe there is a rule of thumb that one could go by if one were to use an inclinometer.