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The module talks of rear bumper but does not cover how to measure bump steer on the rear (leaf spring in particular) or change or optimize the effects of rear steer
You can get a good, close estimate by considering the relationship between the spring's front fixing point on the chassis as one end of a virtual radius rod, and the centre-line of the axle as the other. As the axle moves in relation to the chassis - or vice versa - this virtual rod's ends will move through an arc, as will, of course the other spring's. The arc will alter the longitudinal relationship of the axle mounting point to the chassis mounting point - it will move the springpad/axle backwards or forwards.
If you plot these points for both springs, you can figure out the bump induced steering angle.
Normally, if the front spring eye is higher, it will "steer" out for oversteer, if it's lower, it will steer "in". In roll, it will depend on the angles of each, and how they move, whether it's causing roll understeer, or oversteer, or the scariest thing - a transition between the two over "two wheel" bumps while in roll.
