I first drove the Alaska Highway in late November 1972 on my way to my new duty station, Elmendorf AFB. I was driving a retired CA highway patrol car that turned 100,000 miles about Oregon. I started from Biloxi MS via San Diego (family) To Anchorage.
The road today is vastly, vastly improved over that time and there is no reason to caravan. There are plenty of services of just about everything you need all along the way.
I would just buy the Milepost and use it. It is really all you need and it's a mile-by-mile explanation of everything along every route you can take to Alaska and in Alaska.
Just Go have fun and dont worry.
I will be leaving the Baja in March and heading north to Alaska myself.