There are/were six remaining states that have a registration limit of 40'. Two these (I am not sure about the rest) are NJ and Md. I am not going to say it has not been done, but in my case, for NJ, I made an official inquiry through the DMV for a ruling/statement. The official answer, on a state department letterhead was: up to but not over 40 feet. No. At the time I was contemplating a 47'3" Newell (yes, they made a very few over 45'). That is why I made the inquiry. NJ and NY were 2 (CA was the third) of the 8 states that were restricting to 40 feet. NY changed when the then Gov. Pataki administration was reportedly asked to review/relent - related to an upcoming FMCA event. NY changed, CA changed, NJ did not. But often DMV officials at state inspection sites do not know about certain issues. That does not absolve the owner (like the IRS). State inspection of large diesel RVs was subsequently changed to private contractors licensed by the state, because the state facilities could not handle the weight and sizes.