Brian111 ,
not sure if this helps , but my cousin was looking to import Landcruisers into Canada ( long story ) and it seems the only thing he could do so legally , with very little hassles , were vehicles over 15 years old . I don't remember all the details , but I think he mentioned that bring a new/used car across the border you have to pay huge tax fees ,etc . Again , can't recall the details , but he did a ton of research , and mentioned there was a lot of info on the Canadian Federal government site . Good luck .
As a side note , I once met a guy here in Alberta that made a HUGE pile of US dollars by buying used diesel trucks and selling them in the US . This was in the late 90's up to about three years ago . I'm pretty sure he swindled a ton of innocent folks about warranty issuses and such , and his used-car dealership has since closed and he's nowhere to be found . I do think that the government /border patrol have tightened all the loopholes to avoid this happening (probably pressured from the manufactors/ angry warrantyless buyers ). But you never know .