Almost an aside; Consider the load on your front tires and their rating, not just the axle.
For the arithmetic assume the weight of the bucket is out there at about its pivot, typically 4 ft or so and LEVERED on the front tires.
If you are into the "lift all you can and raise the rear tires off the ground" mind set you can assume that ALL the weight of the whole tractor, ballast and load is on those front tires.
Even if you are just a bit short of that think about carrying so much weight on the front TIRES and having one of them blow out.
Just ONE of them, say the one on the down slope.
For the arithmetic assume the weight of the bucket is out there at about its pivot, typically 4 ft or so and LEVERED on the front tires.
If you are into the "lift all you can and raise the rear tires off the ground" mind set you can assume that ALL the weight of the whole tractor, ballast and load is on those front tires.
Even if you are just a bit short of that think about carrying so much weight on the front TIRES and having one of them blow out.
Just ONE of them, say the one on the down slope.