I am not sure about his economical thinking for a person that filed bankruptcy 4 times and now a president.
The trade war is basically because USA imports more than exports. Population needs to be considered in there. Very hard to export as much up north than what you import when the population is 10 times less, and he needs the resources, which is why he wants Canada as the 51th state and be treated like Puerto Rico,,, ho hell no!
For cars and trucks, People up north also buy SUV and Pickup that are all built in the USA, so something needs to be built there as well, like it or not, and a factory needs to be profitable.
Next option is ditching all USA made vehicles and import from Europe and Asia only and maybe have the chance to get more manual transmission
This is something I really do not wish to see. I have good friends on the other side of the border, and I do not want to see anyone suffering because of all this. Him, he does not care. I have seen one of his luxury home (with more rooms he could ever use) in West Palm Beach 25 years ago looking almost over the other side on poor people (plywood in windows and broken streets).