How do Canadain rv standards differ from U.S.

Even when a RV is manufactured to meet standards of both countries (certainly possible, if you can get U.S. buyers to accept the Canadian version), factory certification that it meets the standards eases the process of importing it to Canada.

I know that one of the differences involves which add-on accessories are permitted to exceed maximum vehicle widths. It becomes an issue when the vehicle is already maximum width wall to wall.