Passing thru BC, YK to Fairbanks - bring motorcycle or not?

Roads that way are, in general, very sketchy due primarily to continual weather damage and permafrost heaving. Your RV will be jouncing along, as will the jeep. Less stress is less stress, but any experience is unique when done with a bike. :-)
Since (it sounds like) you haven't been before, I'd suggest enjoying it with the group and the other toys, and go back with the bike next time. It's amazing!