Camber and then some
 

I have a 2012 X5 4.8 with staggered, 275/315.
On a trip back from Nashville in our Saab 9.3 road trip car, I am observing all X5 and especially those with staggered.
What do I see, one with a very noticeable "camber" on the rear 315s, I mean looked like a "drift" car. What would be the reason to do this, good or bad? ....it did look kinda cool!
Thanks,
Ralph

You had me at “Saab 9.3 road trip car…”. Awesome. As a former Saab owner (‘86 900s) I bet that phrase hasn’t been uttered in decades!

As far as the camber goes, alignment specs from bmw allow for a significant amount of negative camber (helps the car corner aggressively) without abnormal tire wear. Out of spec camber usually seems to go negative though and usually stems from worn bushings in one or more of the suspension components.

I don’t have any experience with lowering, but I read that lowered suspensions can screw up camber too. I know going up does. My small lift has put my front wheels just over the camber limit. The front camber isn’t really adjustable beyond a small range so I could do camber plates, but I haven’t noticed any crazy wear yet after a couple years.

Camber and then some
 

Aa long as tire wear is even it's not a problem. Inner edge tire wear is from loose joints allowing the wheels to toe out under braking and it's very dramatic. Mine wore though to the redneck wear bars (metal belts) in under two weeks.
E53 can run 30-40,000 miles. if the toe is straight.