I've been reading/studying suspension design back to when autos were invented. I've never heard anything about toe-in or toe-out setting having anything to do with road-crowns as you mention. I don't see how it could since crowns vary widely and often do not exist at all.
The idea of a toe-in setting on a stationary vehicle is so when moving - it is zero - i.e. both wheels perfectly parallel to each other. Much as to do with counter-acting camber-thrust from the steering which you do not have.
1/16" is common on trailers. Just enough let the wheels pull themselves into parallel positions when rolling.
Toe-in and Ackerman Angle setting are both there to keep the front wheels parallel to each other when moving. Toe-in when going straight - and Ackerman when steering into a turn (does not apply to a trailer).
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