Key people who  know Trump  (Mulroney, Black)) as well as some of his Cabinet choices , say that they are well disposed towards Canada, and that their problems lie with Mexico which does not have the same standards as Canada . Neither has Canada moved US plants out of the US, nor invaded them with millions of immigrants, nor developed a large trade surplus.  
So I think that Canada should go its own way, let the Mexicans negotiate their issues , rather  that being lumped with them as a common enemy. Canada should also trade more with Mexico, but in a balanced fashion.