Best thing is to de-camber the rear end. There are various methods, from shim-plates which are basically steel plates you put inbetween the rear hub carrier and the rear beam. These plates are angled to adjust the camber accordingly. You will have to get a machine-shop to make them for you.

Or you can simply shim it yourself using anything from a washer upwards (please note that I am not condoning this method due to possibilities of stress fractures occuring due to loading, etc..., but I have seen it done in the past.)