I bet I've crossed the Canada border a couple hundred times, with a car, with a pu,. and with a pu pulling a loaded trailer. I've pulled all kinds of loads of tractors and other junk, even a huge load of 5/4 cherry, pulling that load all the way to Alaska.
Over those crossings, I've been checked, even searched, but mostly just been asked a few questions and waved on through. Those that have problems are either guilty, look like a bunch of hippy dopers, or cop an attitude right off. lol (I'm betting the attitude problem is the biggest problem)
They have a job to do, I try to make it easy on both of us, and mostly they wav me on through.
SR