Have altenate route plans and options as roads can be closed for various reasons without notice. Think floods, fires, etc. ANY place can be closed without any notice so be prepared and flexible. We established Canada cell access before leaving. Also make sure several credit cards had Canada access. I never expect or want WIFi access in the US or Canada as its to easy to hack. We used Verison for internet access, now have T Mobile.
The roads will have pot holes, frost heaves and chip seal rocks. They are what they are and if open go. There aren't many alternate routes anyway. Our only pre trip decision was to decide at Tok a clock wise or counter clock wise trip around Alaska.
Fuel is expensive but best to never get below 1/2 full.
Example: One camper was having engine issues in Haines that could not be repaired there. His decision was to take the ferry to Vancouver Island for repairs.