Canada needs to go into these negotiations with its own well-constructed and documented list of concessions that it will want as a quid pro quo for changes the US will ask for.  Otherwise, Canada's negotiating position will simply be 'please keep concessions ask of us to a minimum' and that is hardly a firm negotiating stance nor is it the case that Canada doesn't have some valid complaints of its own.

For example, the US subsidizes its Agricultural industries big time albeit not through supply management to the extent Canada does.  Canada should push back by insisting that the US either reduce its subsidies (hardly likely). or recognize to a greater extent the equivalence of US subsidies and Canadian supply management from the international trade perspective.

THen there's foftwood lumber...