Wife has an F11 touring M Sport with the19's and the 30 profile tyres, car racks up 500 a week and is suffering with bulged sidewalls on the run flats potholes are rife up here,causing the premature replacement of the tyres, two in the last month has miffed her a bit.We like the peace of mind of the RFT so have decided to swap the wheels for a set of 17's from an SE. there are plenty of sets from saloons on ebay so my question is are the saloon and estate the same set or does the touring have a higher load rating on the rim? Just want to be insurance safe in the event of the what if.