I think the worst thing you can do is "overthink" this (which is what I did last summer for out pending trip to Canada). The only "constant" is that every border crossing and inspection is usually different.
Having read so much [mis]information about what to expect when entering Canada, I scheduled an extra day in Shelby, MT to allow for a drive up to the border to see what I needed to enter Canada. What a waste of time. The border agent just said to show up and they would handle things then. When we did enter Canada, things could not have been easier. I just made sure to focus on the questions being asked and answer each of them accurately. The whole experience was very nice and a wonderful introduction to a wonderful trip to Banff.
As you may or may not be aware, a lot of the "Inspection Stations" are now on the freeways. On our trip from CA to New Orleans we were stopped at two of these "Immigration" checkpoints. There are about 20 cameras on a pod along the side of the road and I would imagine they are doing automated license plate "checks" on each vehicle that passes through. Our coach was "sniffed" each time and on one checkpoint the dog was apparently confused by something he smelled because there was an extended "sniff" of our coach. But, unlike the old days of crossing the Hoover Dam, no one entered our rig or asked to inspect anything below the floor.
So my advice to you is just put away your worries and enjoy the adventure. If you catch a cranky inspector you might have a delay. But, odds are strongly in your favor of just having a breeze of a time.
Just my experiences.
2003 Beaver Patriot
2014 Honda CRV Toad