Hi Tor
in my MD80's AOM there's no reference about maximum crab angle the main ldg gear can withstand during landings.
Once someone told me that a 4 degree crab angle was maximum for a DC9 (but i doubt about this value!).
What i do is landing as straight as possible during a x-wind.(Low wing tec.)
Hope this can help
BTW thanks for your replay about the visual app. minima
B_D