Re: Where is the rollover point
ejb - Have you seen all the posts on the tiltmeter? The manufacturer's site is
http://www.tiltmeter.com, and you can buy them directly from them, too. (But if you want the #7490 with the adjustable warning beeper, be prepared to wait a few weeks, because one state's highway department just ordered 1000 of them, so they're backordered.) If you don't have one of these (with or without the beeper), I'd highly recommend it. You can then have an accurate, reproducible indication of the exact angle of the tractor. Your behind is just not a very good indication of slope. At least mine isn't.
As you acknowledged, the rollover angle differs tremendously for various tractors. I've tested mine pretty extensively to get a feel for what it'll do under worst case circumstances (with the backhoe on the tractor, which raises the center of gravity, but lets me put out the stabilizers to catch it when the angle gets too steep), so I know what mine will do under those particular circumstances. I'm a little hesitant to give numbers, though, because I'm afraid someone would mistakenly assume that their tractor would behave similarly to mine, and that could likely cause them to have an accident.
I can tell you this: Once the angle of the tractor gets to 20 degrees, extreme caution is in order, even in the best of situations, with most tractors. If you've got a load in the bucket and it's not close to the ground, you'll not likely get near 20 degrees before it rolls over.
Depending on how interested you are, I could email you some numbers for very specific test situations, but I don't know how relevant they'd be, and I would have to strenuously emphasize the "don't try this at home, for comparison purposes only, your mileage may vary" caveats.
Mark