Same here, my dealer says not to rotate. I have the sport package with
same size wheels front and back. The only reason I would rotate them, would be if the tires were cupped. I have those crappy Bridgestone tires on mine. I had Michelin's, but my wheels came in damaged and they swapped tires and wheels off another X5 and I got stuck with Bridgestone's. The Bridgestone tires are loud and don't ride as good as Michelin's.

Craig