Well, through CouchSurfing.com I found someone to send my tires off to. They're in Whitehorse — almost. So, I guess I might ditch the Robert Campbell highway on (at least) my out leg of the trip.
Here's a new chunk of part 3 and the rest of part 4:
So… going west from Watson Lake, through Whitehorse to pick up the tires and swap out, up the Yukon Highway, over the Top-of-the-World highway, through Tok, then to Fairbanks.
We're hoping to get to Whitehorse (well, Marsh Lake) on Sunday, Dawson by Monday, Tok by Tuesday and Fairbanks on Wednesday. The next step really depends on how good time we made. If we get there on time (or earlier), the next step is heading up to Deadhorse… otherwise, south to Anchorage to get En on the plane back home.