Personal RV'ers are still exempt while on vacation. Toters, persons delivering new RV's from factory to dealer or dealer to dealer, are required to go through as well as have their US DOT certifications in place. If you are towing a trailer that is hauling goods or services for any other business purpose are also required to cross. This is because it is a for hire endeavor. Trailers in excess off 10,001 pounds GVW require a class B drivers license. Hope this helps the confusion I created on my thread. AL