the tread on the front was basiclly bald. And i just got back from the allignment shop and they tried alliging it but both rear wheels have to much negative camber for them to adjust out, along with the front right have a little to much negative camber and is also toed out just a bit. I know i can shim the rear wheels but how much can you shim it before it's no longer safe. And as for the front wheel do i need to get a samber kit up there and what about the toe issue?