I might have crossed the US/Canadian border more then all of you, combined. Back in the "working world" I crossed often enough that some of both the US and Canadian personal would say "See you next time".
To the original OP, that was nothing, just short and terse.
I've had more issues with US then Canadian, both before and after 9-11. But things certainly got, more interesting, after.
One time I was returning to the US by an unusual crossing and ran into a US guard that didn't appear to understand that yes I could be in Canada driving a US Gov vehicle, on US Gov business. His questions got more and more belligerent until he asked me my grade. I told him, he stopped asking me questions and told me I could go.
It wasn't until I was a couple minutes down the road I realized why. In "his world" my grade was a 2nd level supervisor. While in mine it was just that of a Senior worker.
I did have a delay going north once, the guard at the gate told me to go in and talk to someone. I waited about 10 minutes and he came in and we talked for a few minutes. Then he told me to wait, about 20 minutes later an obviously senior person came in and sat down in a private office. After the original guard finished what he was doing, he went in to talk to what was certainly the Supervisor. The Supervisor came out, asked me for my travel-orders, I handed them to him, he said "Thank you, you can go on your way now". The last thing I heard was him telling the guard to come into his office for a private meeting..... I figured the guard received some instructions on dealing with US Gov people on official travel.
The most fun was actually a coming south. I had been up for a tournament. The US guard's finial question was "who won". I told him and he said "good, he's a great guy"
2008 F350SD V10 with an 2012 Arctic Fox 29-5E
When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.