Had the same issue with my GOE rims and had to use a puller to get the front rims off. Lucky this was done in the shed when fitting new mudflaps because there was no way they would have come off in the bush or on the side of a road. I had blamed the tyre fitters because some of them just bung the rim on and then tighten the nuts with a rattle gun without properly seating them first. If the rims are not sitting straight they bevel on to the inside edge. I have finely sanded out the centres and used Lanoline grease so hopefully this was not the wrong thing. One thing I have learnt is that I would not do another outback trip without taking them off and checking that they will come off before leaving.
Cheers

