When I pulled my 5th wheel ( now have a camper) we would budget $175 per day. That includes fuel, food to cook in the rig, campsite, and $20 per day for “stuff”.
Now when you only travel for a few hours per day, you cut down on fuel costs.
When you stay in a campground for more than one night you save on fuel, but you still have campground costs, food ...etc....
The only time we hit the $175 per day was when we did long days drives and we stayed in a campground. Or if we ate out a lot or did a lot of tours/ museums etc to pay for.
Now if you dry camp ( a lot of people call it boondocking) you will cut your costs dramatically, but you will always have fuel costs and food.
My wife is from Northern BC ( Stewart) and we have done a lot of trips up there over the years. I’ll bet you will love northern Canada and Alaska, they are beautiful, and make sure you have “loads” of time available for your trip, which is about the one piece of advice we will all agree on.
And traveling to Alaska is not all the different from driving around where your from, it’s just a long ways to go to get there, and most major Hwys are paved. The distances are longer between towns as are fuel stops.
One tid bit of info on fuel is always fill the top,1/2 of your ya tank, meaning If your in a town or see a fuel station fill up if your fuel gauge is near 1/2.
We were caught once up north when I didn’t fill up at Bell 2 and I just rolled into the old gas station at Maziaden Jct. on fumes... never did that again...
Have fun.
Soup.