Zero out rear toe, and camber as close to zero, depending on mileage change out the rear arms, balljoints etc,

One more option is get directional tires not asymmetrical, when inner edge is worn, get them remounted flipped from one side to other, now both worn edges will be on the outside where it does not matter as much. I got 35k out of my last set doing that and am very lowered, didnt change anything in rear yet and my camber was brought in as close as could be but its still about -2.7 each side (changing my arms and balljoints will probably tighten it up a bit more)

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2006 X5 4.8is Fully Loaded