I think there are some people who have exceeded this weight limit but for me ive never really taken pillions, only every in emergencies or breakdowns. But i have loaded my old XTR up with two full 48ltr panniers, a half full top box, tank bag, 5kg tent, sleeping bag etc and also im not the lightest at 15-16 stone.

If you have a luggage frame this should strengthen the rear subframe a bit as its extra rigidy for the rear of the bike, or the other option would be to make your own pannier frame and design it dually as a pannier frame but also to add strength.

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Plough on