If you pack sensibly with the right sort of clothing you don't need a luggage rack, many bikers manage with less storage. We have done trips with two of us away for about two weeks without a rack. A bag will fit down the passenger footwell in addition to packing the boot fully. You just need to travel light, think about what you need and take the right sort of clothing that washes and dries easily. Or you can pack everything onto a luggage rack, unpack it every 200 miles to refuel, be top heavy, wallow on corners and increase the already dire aerodynamics of the M3W and then transport it all to and from your accommodation stops. It really just takes a bit of thought and planning, rather than thinking how to increase the load capacity, and you save the cost of a rack.
