Shucks, I didn't see Grouse Feather's calculations until now.
Here's a little more info: both tractors have R4 industrial tires. For the past two seasons, the B2920 was "stock." This year, I had the rear tires loaded to 80% and added 2" wheel spacers, widening the track by 4".
The L4310 appears to have its rear tires set as wide as possible. Those tires are loaded as well.
Both machines are being run with loaders attached and buckets just a couple of inches off the ground.
I'm curious as to which one, by the calculations, is actually more stable. I run rollbars up and seatbelts on for both machines. I think a roll could be catastrophic since I think it would roll multiple times down the slope. The L seems like it would have a better chance of keeping your legs inside the platform.