Hi,
I weigh 64 kg
bike 15-17 kg (not know exactly)
Maximum load 50-60 kg average 35-40 kg.
I would say that the rider weight isn't a problem, because bikes are designed for that weight. The luggage should not weigh more than 40 kg.
You should buy good rim (no Mavic) and good carriers (blackburn / tubus).
Thomas