Quebec has introduced a well designed wheelbase law, and some provinces are following suit. I imagine most will eventually:
http://www.mtq.gouv.qc.ca/portal/pag...4400144F0104BD
You're allowed up to 7.2M wheelbase with a permit. Anything over 7.2m is not allowed. 7.2 is the equivalent of 283". This increase in wheelbase needs to be coupled with a decrease in trailer wheelbase.
Now if this is introduced Canada-wide, this would be very good although I imagine many American trucks still would be "illegal". At least give us Canadians some flexibility.