Bit more info... BMW specifies a whole range of tires for the f30 340i, square and staggered. Most of these are runflats with rear load ratings ranging from 91 to 95. The only non-runflat tire set was stock on my car with the track handling package with XL rated Michelin PSS.
I don't think there will be an issue. I don't plan on doing autobahn speeds with the car loaded to GVWR. (And even then the axle load is apparently supported by the other tire sets)
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