+30 in the rear shouild be fine if your not to low
I had to pull the rear fenders a bit to get the 9 +20s to fit without a huge amount of camber
you can really fit anything you want on it. i had an 18x10+20 wheel on there, but i didnt pull the fenders far enough, so it hit the strut becuase of the amount of camber i was running.