US states and Canadian provinces honor "reciprocity" when it comes to drivers licensing. If I am legal to drive my 40', 27,000lb, air brake equipped RV in Washington with my current license other states will honor it even though the particular state may have different requirements such as endorsements for over 26k lbs or air brakes.
I have had folks tell me that the same applies to equipment regulations such as overall length and pulling doubles or triples. I don't buy it. I have had two LEO's tell me that in their state enforces their own length regulations regardless of what your home state allows.
I was almost 65' when towing my pickup. I ran all over the country and got two warnings and no tickets.