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If you know how much weight is in the container, you can measure the distance between the rear axle and the center of the box, then multiply them together. That will give you the torque that the manure is putting on the axle to lift the front end. Now you measure the distance between the rear axle and the front of the tractor. Divide the torque by the distance between the front end and the rear axle, and that will give you your weight. That's the simplest scientific way to do it, but you have to know how much manure weighs. In reality, weighing the manure is going to be pretty tedious. You'd have to weigh a 5gal bucket of horse puckey on a bathroom scale, then figure out how many buckets of horse puckey it takes to fill the container. In reality, it's much easier to trial and error. Whatever you do, don't make your front end weight more difficult to deal with than the loader. At that point, you may as well just put the loader back on the tractor. The simplest solution is to not put as much manure in the container. If you're lifting the front end off the ground in a simple see-saw scanario, IMHO, you're putting too much weight on the rear axle.
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