Maybe try this explanation. Say you have an axle that has absolutely no toe in, both wheels point perfectly straight forward. You mount that axle on a trailer with correct track. No matter how you adjust the plates you will never get toe in from that axle. You will either have the entire axle pointing dead straight ahead or you will have the entire axle pointing out very slightly to the left or out very slightly to the right. (Dog tracking) If people reading this are still not convinced, I can't figure out a way to explain it any clearer.
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