For anyone thinking of buying a bike with luggage rack you will see the mounting plate is required for luggage rack to be fitted so the cost is very high for a simple rack.
Having looked at the loading options today, the Touratech racks hold the Wolfman panniers fine with one of the wide straps locating underneath the seat and the other just off the seat. There is plenty of room for a roll bag across the pillion seat and top of the panniers.
The standard rack that comes with the bike is perfect size for the Wolfman tool bag. This fits without the £380-£400 rack add-one being required.