I never said that one bike is ideal for all the rides. I want to minimize changes in equipment due to past issues. A very small change in position on the bike can cause my ITB to flare up. That being said, I would like to ride the same bike on all of the rides to lessen the impact. All my bikes are set up very similarly (especially the trek and scattante) yet switching between bikes can cause me issues on longer rides.
I will be carrying my stuff in a carradice bag and I have a rear rack that I could use as well.
I ride with 28 to 32 mm tires and I'm not as concerned about aluminum being harsh. I have ridden this bike (Scattante) on a offroad 200km ride last year and was pleased with the bike.
The RS2 cannot fit regular fenders (possibly race blades).