I have put a leveling kit or suspension lift on every truck I've owned. Never had any issues with any leveled vehicle. Took them all past 120k miles. Now my wrangler and the extreme lift I put on it was very tough on the drive train.
I feel that with the way the GC's with the air suspensions work and the minute change in suspension height there shouldn't be an issue. Air lifted jeeps go well past the amount of lift the leveling kit provides and also lower creating other driveline angles in the opposite direction.
I guess only time will tell. But as of yet I've never had a problem with trucks I've leveled.
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2013 Wrangler Rubicon Unlimited Commando Green 2.5 inch Terra Flex, 35x12.50 Grabber RED LETTERS
2011 Grand Cherokee Laredo E Stone White, ORA1,Factory Tow, RRO leveling kit. 32x10 BFG Mud Terrains 13 Rubicon Wheels