Should not be an issue. I run 680kg rated ///M3 aftermarket wheels. That limit is reached with 4 passengers and luggage, when I tow with the X loaded or long distance hwy tow the OE wheels/tires go on.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!