Well....they've been making upright bass necks for 400+ years with at least a gigantic 42" string length and occasionally in the 44"+ range with an average of approximately 300 lbs of tension. Nobody uses an adjustable truss rod on them & never have, but almost all contemporary builders use rigid carbon fiber rods under the fingerboard. Bass players are far more fussy about fingerboard relief and have a much better understanding of it than almost any mandolin player I have met.
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