I just signed up for my third randonee, the King Ridge 400. Unlike the previous fleches I rode there will be a 90 mile stretch of unpaved road with lots of climbing. Right now I own a pair of 32mm Schwalbe Marathons that are tough enough for all that dirt road and I am confident on the dirt with road tires. However, they aren't the softest or lightest tires (on an already heavy bike) so I don't know how good they will be for the comfort on the dirt and energy saving over the whole course. I'm going to hit the trails asap but I would like to tap into the collective experience of this forum. What have you used for similar rides? Am I over thinking this and just go out with what I have?