Thank you all for your comments!
I measured our rig height with the canoe on top and we are at 12’-4”. In Quebec and Ontario 13.6’ is the maximum permitted vehicle height so we shouldn’t be good on all major highways. Still looking for an app that can help with route planning.
We’re off for a four week trip to Ontario’s Georgian Bay Area next Wednesday. I B.C. will monitor our proposing issue to see if suspension mods are really necessary. In the meantime, any recommendations on tire pressures? Right now I’ve got 80 in the front and 70 in the dual my rears.