Conventional wisdom, which comes from FAR Pt23 I believe, is 2/3 maximum symmetrical g with full aileron deflection at Va.
re. earlier discussion, I have a finite element analysis of my G-200 wing which shows the highest stresses at about 40% span.
SAAA #727 (TC)
RV-4 VH-PIO ~600hrs
G-200 VH-OVR ~250hrs