In my part of Canada (Western Canada), I haven't seen many European trucks. The winters are long (5.5 months +) and cold...can go down to -40. In the northern part of my province conditions are quite tough. In fact the cable TV show Ice Road truckers is filmed here.
If you break down on some lonely northern roads...it's very cold without a heater. You want the utmost in reliability in a vehicle.
We have the Mercedes Sprinter, formerly marketed as the Dodge Sprinter. One thing I note about them is that there seems to be rust issues on the body panels. I don't know how well they do...day in....day out up here. I'm assuming ok mechanically, but I don't know.
We have Volvo highway tractor trucks...same models as are used in the USA. They seem to be fine for our conditions. I see quite a few and have for years.
The great majority of our trucks are American makes, such as GM, Ford, Ram for light duty and for medium/heavy duty makes, the vehicles are generally Mack, Kenworth, International, Peterbilt.
There are a few Toyota (Hino), Isuzu (a number of older, badged as GMC) and Nissan medium duties, but I don't see a lot of Asian trucks in my neck of the woods.
Both the American light duties and medium/heavy duty makes have done well and proved reliable/durable in our severe winter climate....for years. The American trucks dominate the Canadian market and have since the beginning of motor vehicles.
Why the European...or for that matter Asian truck makers don't make more marketing forays into Canada/USA markets I don't know. I don't know how the Euro/Asian trucks would do ? Possibly ok....but I don't know.
North America is a huge market, would seem to be very appealing for any vehicle manufacturer.