I have driven my truck on both sides with no problems. The only thing I can think of is the US purchased truck comes with the US disc that only covers 100 miles into Canada........Canadian truck comes with Canadian disc and 2nd disc for US.....the Canadian disc covers most of the top 50% of US states. All you might have to do is get them to cover the canadian disc.
The US DVD for crossing the border totally sucks unless you live in Vancouver or some larger city right near the border.
With the Alpine description, I actually expected an 100 mile band of all the roads in southern Canada. WRONG! It only gave main arteries and none of the secondary roads in western Alberta and eastern BC. We stayed away from the major cities, so I don't know if it got better at other points.
Look at this thread for some of my observations about using the US DVD in Canada: