sec. of state don't know **** about the rules. Talk to your local commercial motor carrier enforcement officer. spoke in depth with the one from canton, after he issued a no medical card ticket. very informative about what is and is not legal. best part is each and every city or town can and may have their own rules and requirements for what is a commercial vehicle. Best to get to know who is enforcing in each city you work in. Dosn't hurt to donate to their favorite charity as well.