Any of the "Parkways" in New York built as part of the road projects constructed during the depression are prohibited to trailers and all commercial vehicles (even cars with commercial registrations). Motorcycles were even prohibited until the late 60's early 70's. But, your right, too bad travel services and GPS's don't know this!!
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"PT Crew Members Since 9/2010"
2011 RAM 2500 HD 6.7L CTD Crew
2014 Prime Time Sanibel 3250