Good question Glenn, because different states have different ways of taxing your coach and charging for license plates (tags). Another issue to consider is whether you will be subject to sales tax depending on the age of your coach.
Forum members from the U.S will be able to provide better insights, but from my recollections Vermont and Las Vegas were couple of States with low yearly fees. When I had an rv registered in Vermont, they sent the renewals to my Canadian address.
Will be looking forward to the info you receive. In what part of Canada are you located and what type of coach do you have?
Enjoy the RV Forum!