Just a little note to let everybody know, if you are going to take a tractor or equipment with you into Canada, you'll want to stop on the American side and fill out a form showing what items you took into Canada, (make model and serial number) and when you return, it will make things go much smoother. 

I don't know about the other crossings, but the one in Port Huron does NOT have any signs showing where to pull over and do this. If you get to the toll booth, you have gone too far. You will see other trucks pulled off to one side, with a building nearby. Go there to get your form filled out. It shouldn't take long, and will make the return home a breeze.