I would honestly take something a little more solid. Something 4x4 with clearance and a solid powertrain. Good luck, sounds like a wicked trip.
Sent from my Galaxy S3
Good grief, you can go to and through most of the Yukon entirely on paved roads. Isn't all of the Stewart-Cassiar paved now? People do these roads on bicycles, for heaven's sake.
As one of those people, I recall seeing bumper stickers on motorhomes saying: "I drove the Alaska Highway". Like it's a big accomplishment. Unfortunately the Dempster Highway bumper stickers wouldn't fit on my bicycle.
Having bicycled many of them on a 10-speed style bicycle, with only one flat tire total on the trips, I have a few cautions for motorists.
When on gravel, slow down when meeting another vehicle. This is a courtesy that reduces dust.
Then there's damage from flying stones. From cycling these roads I know that rocks get thrown up. Mostly they are just up in the air, rather than hurtling toward you. The faster you're going, the harder you'll hit them. When cycling up there, I'd put my head down to keep from getting rocks in the face from motorists speeding in the opposite direction.
Certainly make sure your spare is in good shape, but you should do so anyway.
Get a copy of the Milepost, but know that despite the many businesses listed along the way, there are more that are not in the Milepost (presumably because they didn't buy ads in the Milepost).
Beware that wet dirt roads can be extremely slippery. This is partly because they put some sort of salt brine on them to keep the dust down.
Again on gravel roads, be careful on corners when meeting traffic and passing cyclists. Loose gravel gets pushed to the outside of the corner. If you get into this stuff at speed, you can lose control. And forcing cyclists over into it, or passing them while they're in it trying to stay out of your way, is a high risk situation.
Have fun, it's a great place to see.