Toe is non-adjustable in the rear as you state, but is still important to measure. Also, the toe does change with suspension compression due to the radius arm moving in an arc; this is what provides a small amount of rear steer with body roll.
I agree camber change is more pronounced than toe change with suspension compression in the rear.
The front likely has little or no toe change as long as the steering rack is level and at the correct height relative to the control arms in straight ahead.
Still toe out on turns is affected by ride height due to SAI and Ackerman angles.
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