Tyre and tyre construction dependent.
Dunlop D21 slicks in 265/655R18 are stiff construction by max neg is ~3 deg neg camber front and half that in the rear.
The D21 290/675R18 is a taller sidewall and allows contact patch distortion and you'll get max grip above -3 deg
The D21 is harder and the D31 is softer and the D31 will not tolerate as much neg without excessive inside shoulder wear.
The simple answer is to use a tyre temp (probe) to assess how much heat is induced with camber and decide on that basis.
Camber (and toe) settings require testing to get right.
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