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I don't know how you would get any data on limits, but not only is your rear axle sensitive to total weight, there is the fact that it serves as the axis for a rotational moment. The greater the distance any added weight is from the axle, the more torque it applies, which tends to lighten the front end and can affect steering. Think of the adjustment the kids make with a see-saw, to counterbalance one another. Or think of a torque wrench...it measures in foot pounds, which is the torque generated by a linear force of one pound applied using a one foot lever arm. You can double the torque by doubling the force OR by doubling the length of the lever. Archimedes supposedly said that given a fulcrum and a long enough lever he could move the earth.
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