Y'all come on up now, hear?
Come on up and check out the state, love to have ya! Hopefully I'll have time to ride with you guys. No promises, I'm starting a new high stress job in two weeks and I don't know how things will be going by then. Definately stay in touch as your trip comes together.
From Fairbanks to Deadhorse the mileage is about 500 miles. I think about 400 miles is unpaved, and it's an a$$ kicking road. I'm sure I could get from Fairbanks to Deadhorse on my VTX, but I would not want to. It's an R1200GS or KLR-650 kind of road, if you know what I mean. At the very least you'll want to fill your trailer with gas cans because the stretches between available gas are very large.
That highway is the only link up to the oilfields, there is no railroad up there. Thus a huge portion of the traffic on the gravel highway is 18 wheelers, and I can tell you from personal experience that they go FAST on that road. I definately recommend that you read the introduction to that highway in the Milepost again, and be sure you're up for the challenge. I can guarantee you will damage your bikes on the highway, most likely from gravel flying at you from oncoming traffic. (Not that an excuse to buy new chrome is a bad thing.)
I've been up there twice, and I can say that it is very beautiful. Barren, but pretty interesting. At least as far as north of the Brooks Range - I haven't done the drive from there to Deadhorse. It's all flat for that last portion.
I do know understand the desire to go that last distance. If you're comitted to going, then you ought to plan on stopping by my place to outfit your bike with some temporary guards for the highway. It's a common thing for folks to do on their motorhomes when they head up that way. We could cover your headlight with a piece of plexiglass, and probably find some functional but unattractive padding to protect some of the front end pieces with to minimize the damage. And I have a bunch of gas cans you can pick from for the trip. I'd be happy to store anything displaced by the gas while you make the last leg of your trip. If you wanted to mail any special gear up here in advance I don't mind picking that up and storing it for you until you get here. (Snow in June is not uncommon north of the Brooks Range. The soil only manages to thaw about 12" down during the "summer" up there.)
It's a little hit or miss, if you manage to avoid the rain then the road might be in good shape. I don't want to discourage you too much, I just don't want you to get hurt if you were unprepared.
Back when I worked on campus about 6 years ago, some students I knew rented a car and decided to drive up to Deadhorse on a lark. They did not realize that it takes about 16 hours to get there. They also didn't read the fine print (actually it's rather large print) that says you can't take a rental car on that highway. When they got to Deadhorse they were disappointed to find out that the last couple of miles to the ocean were on oil field property, and they were not allowed to drive on it. Then there was no gas station (I think it was closed when they got there later than they planned) so they had to beg some gas off somebody in town. On the drive back they lost control on a corner with stutter bumps and rolled their Taurus. They were all fine, but the car was totalled. And the car rental company insurance did not pay for the car, because they specifically exclude a couple of gravel highways up here. That's the experience I'd like you not to have.
With some Red Green engineering and advance planning I think you could potentially enjoy the ride. If you PM me your email address, I will send you some pictures taken along the highway so you can see a little bit of what it's like.