Just like the recent commenters that have posted pretty much sums it up that I can also verify -
I have no solar power and rarely use my Honda 2000 generator which is mainly for a backup and glad to have it when it is needed....Fairbanks region does NOT get dark between mid May thru the first week of August, so plenty of daylight here during summer - it will get dark south of the Alaska Range like 3 to 4 hours per day in the Anchorage area during June ...
Solid repacking wheel bearings and quality tires is a must for a piece of mind trip like this - you especially don't want mechanical problems in remote Canada unless you want to give up one of your kidneys and first born per se.
I would highly recommend installing new wheel bearings with new races since the travel trailer was mentioned well used condition...
Living here in the arctic region I only use red #2 lithium grease year round for all my rigs and trailer, as it has a very high and low temperature range protection, doesn't break down much and has decent water resistance too.
Frost heaves are sparsely around the Yukon and a few places in Alaska, you really want to slow down while driving thru these bumpy spots or face potential damage to suspension parts or worse...
Binoculars.....make sure you have binoculars onhand too.