We drove this highway in early May of 2017 and later in July of 17. Frost heaves were more apparent in the early part of the trip. My F-350 had a 24 gallon OEM factory tank and I carried one extra 6 gallon jug of diesel, but never put that diesel into the tank until I reached Alaska. Fuel stops were readily available and I fueled up every time I got to around 1/2 full.
In summary to answer your questions: The highway in question is comparable to those in the lower 48. Some short stretches of construction / road repair will be encountered. These sections are clearly marked and can be recognized as construction areas as long as one takes note of the markings. Fuel is available, although some stations are credit card only with NO attendants available. It would be a safe idea NOT to drive past any open fuel station, even if you don't 'really' need fuel.
Enjoy your trip. Take your time and stop often. Some of the very best meals we ate in Canada were at the highway fuel stops where the long time owners, complete with full beards and white aprons, prepared your meal. 'Slab' beacon in Canada was a memorable treat.
Safe travels,
Lakeside