X70 Alignment help

[jdbretz]

I have an '07 X5 4.8i with 21000 miles and have the staggered style 214 wheels and like many others, I am having severe wear on the inside edge on my rear tires. From what I've read this is because the camber is off. I took it to a local alignment shop to have the alignment checked and they said they couldn't do it because the they couldn't re-center the backup camera and the guidance lines would be off. They said they can communicate with the ABS sensor and TPM for the alignment, just not the camera. Do I really need to go to the dealership for the alignment, or can I just have a local shop do it and ignore those lines on the camera that I don't really use anyways? Does anyone have the specs for the alignment? I know the "within spec" the dealership offers leaves far too much margin of error, and I don't want to fix one problem and create another. I am not terribly concerned with handling as most of the roads I drive are all straight shots with very few if any curves so having a negative rear camber doesn't matter much to me. Just looking for some help before I get raped by the dealership. Thanks in advance!