My five cents of advice, travel west in the US. Two reasons: faster speed limit and cheaper gas (a lot cheaper)
Manitoba and Saskatchewan are a lot of flat land, farms and fracking. Kinda the same for Minnesota and North Dakota.
If you make it about half way west through Montana and then cut North you'll be better off.
The first time I made the drive from Calgary into Banff was amazing, you're in for a real treat.
You mentioned a brief trip into Alaska from BC, so you're talking Stewart and Hyder. Both towns are very isolated, fuel and food are expensive, plan ahead. The drive into Stewart is amazing, and if you have a capable toad, drive the mining trail up through Hyder to the Salmon Glacier overlook.