also....(and seemingly off topic)
I was coming up the Alaska Hywy on my trip and I saw a couple of people that had come down the Dalton Hywy (aka the Haul Rd). Apparently they spray calcium chloride on the road in the summer to keep the dust down and it gets on everything and hardens up and is very tough on chains and derailleurs particularly. One guy I talked to went thru 2 chains in the 450 miles and if he had a 3rd he would have used it. I was talking to a couple who I saw a 2 days later who also came down the Dalton and they said you can prevent the worst of the problems by pre-spraying all your stuff with WD-40. In any case, take an extra chain & cables and do everything you can to keep the rear derailleur clean or you'll be replacing that, too.
Also, if you get to Fairbanks and decide you want your bike professionally cleaned go see Fred:https://www.yelp.com/biz/raven-cross-country-fairbanks
It's a hole in the wall shop in an industrial park that doesn't look like much and won't show up in a google search for bike shops. I was steered there by an old friend who's lived in Fairbanks for 35 years and is one of the top racing cyclists in the state. Fred has a reputation as the best mechanic in town and he took good care of me at the end of my trip.