The 5 is wider.
Don't think I'd be happy travelling with my two having the seats mounted on anything to be honest. They need to be rooted to the seat as much as possible.
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2012 F10 535d M Sport, Titanium Silver, Black Dakota Leather, Piano Black Trim, 19" 351M, Sport Automatic Transmission, Reversing Assist Camera, Powered Boot Lid, Soft Close Doors, Folding/dimming mirrors, Elec. fr seats, Surround View, Heads-up display, BMW Business Speakers, M rear spoiler, Sun protection glass, Visibility pack, Media Package Pro
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