I carried a gas 2 1/2 gallon gas can in the Stowaway on the back of the 17, but never needed it (I tow my 17B with a 2010 RAV4 Sport). The only time I came close was when the generator at one of the fuel stops in the Yukon was broken & they couldn't pump fuel. I made it to the next stop with at least a gallon in the tank. Ask for a Campground/fuel list at the visitor center in Dawson Creek (the start of the Alaskan Highway). Very useful for determining fuel stops. We also used both the Church campground guide
& The Milepost
. I preferred the Church book - the Milepost was very filled with ads & appeared to be designed for large RVs, although the additional information was useful.
I went with friends towing a Scamp 16 with a Toyota Sienna van. A journal of the trip is here
We enjoyed two hot springs - Chena Hot Springs in Alaska
(easy access & a dry campground) & Liard River Hot Springs
in BC (a bit of a hike on a boardwalk to get to the spring, dry camping at the campground).
Many of the campgrounds along the highway are at restaurants - while we did cook, there were many times we went to the local restaurant.
While others have stated they didn't have problems getting reservations at Teklanika Campground a few weeks in advance, we made our 2 months ahead of time. When we arrived, there were signs at the entrance to the park stating all the campgrounds were full. The inexpensive rate ($7.00 per night with a senior pass) had quite a few empty spaces at Teklanika even though it was "full".
One advantage of reserving a site at Teklanika is you pay for one day of bus pass even if you stay for a week rather than having to purchase one daily. Unlimited on/off on the busses in the park, the only allowed transportation beyond the campground.