I rode down to Ushuaia from Yukon Northern Canada on a Laverda 1200 in 1980/1981 which is not a bike one would choose for this type of adventure. I did minimum 15k km of all kind of gravel road. I avoided only the roads known to be sandy and required skills I didn't have.
Your biggest challenge would be the dirt roads in Alaska and Yukon if it rains because the mud get very slippery and worst than winter condition. 95% wait till the road dries up because it makes no sense and lack of skill is not an issue.
cheers
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