Hi Julio!
I am reassured by your own 67kg weight, and think that would leave plenty of room for a reasonable touring load on a Raven and still meet your needs on rough roads.
For reference...
• I can go very lightweight, carrying my 0°C down sleeping bag, self-inflating pad, Esbit alcohol cookset and extra fuel, a minimal tool kit, a change of clothing (shorts, jersey, socks), a wind jacket, , 3/4 tights, and full tights with food for a couple days inside my two small front panniers. My rain gear (jacket and good, pants, shoe covers, gloves, and helmet cover) and wool longsleeve jersey or medium-weight fleece pullover ride in stuff sacks under the pannier cap-tops. My 1-person tent and footprint atop my rear rack for a total of 9-10kg + water. My phone and snacks ride in my rear jersey pockets. The underseat bag contains a spare tube, glued and glueless patch kits, a comprehensive multi-tool, brake and derailleur cables, and a bottle of oil.
• For an "average touring" load, I prefer a maximum of about 18kg in weight, distributed among 4 panniers and a handlebar bag, not counting water. Here in America in the 1980s, 18kg was considered an "average touring load" by most bicycle magazines. At that time, water was carried in as many as 3 bottles, each holding ~0.5l to 0.75l (1l = 1kg, so you can calculate the weight of water easily).
If I can count on refilling my water at regular intervals, then I prefer to carry no more than 4.5l to allow for drinking during the day and making dinner and breakfast in a dry camp. Most people seem to get by with less water, but I always try to stay well hydrated. How much I require depends on the season/temperature.
• 25g is the "hard maximum" weight limit on my rando-touring bike, and it allows me to carry clothing to meet variable conditions, as well as a reasonable amount of food and water for some time away from resupply. It seems to be considered a pretty universal "reasonable maximum" when counting total cargo weight, so I think you would be safe considering it an average workable upper limit.
• When researching expedition bikes, I found nearly all that stated a hard cargo maximum used 33kg; Thorn's Nomad is an exception and allows for occasionally carrying more when the need arises, with the caution that handling will of course suffer with more weight. However, it is worth noting the total payload capacity of any bike must include rider weight. A few German brands note total payload capacity (rider + cargo), but this is rare.
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Given your own 67kg body weight and intended use (I also use my bicycles with care), I think you would be okay with a Raven, but like others in this thread, I would strongly suggest contacting Thorn with your questions and information to see what they say. They're very willing to answer questions, and have a large sales and experience database to draw upon for their suggestions.
There is one other point I forgot to mention earlier, that might be important to you: The Nomad Mk2 can use a suspension fork, while the Raven cannot. This might be important if you rode often on rough roads, but a suspension fork will limit your luggage options (front panniers generally cannot be used).
Best of luck, Julio; I realize this is a major purchase, and many of us have faced the same agony trying to choose the "best" model for our needs. The choice is made more grave when a person lives a long way from Thorn or outside the EU, where the trial return period does not apply. Here is Thorn's return policy according to their FAQ (
http://www.thorncycles.co.uk/faqs ):
"What if I don't like my bike?"
Rohloff equipped bikes
If you have bought a Thorn Rohloff equipped bike and you are not totally delighted we offer a 100 day money back guarantee. This means that, if you ride your bike for 100 days and decide you don’t like it, you can return it to us either in person or safely packaged in a Thorn bike box and we will refund you the purchase price of the bike including any or all of the items from our bike build menu.
This offer does not include pedals or accessories. This offer applies to complete bike builds and to EU customers ONLY.
Thorn derailleur-equipped bicycles have a 14-day return period with the same limitations.
Best,
Dan.