I love my K70 Dunlops. I am riding 3.25 x 19 front and rear. I ride pavement, forest service roads, powerlines and snow and they do very well, thank you. I don't do much two-up, but my lovely wife does join me for a trip to dinner or errands on occasion. (She is petite.)
I suppose if I were doing a lot of two-up, or more heavily burdened riding, I would search out a 3.50 x 19 K70 for the rear. CMW only has the 3.25 x 19 in the K70 . Why? (Kevin are you "listening"? :O)
-Jesse, Happily riding the Olympic Penisula