DrewE wrote:
Class C motorhomes are not legally permitted on virtually all New York (and Connecticut) parkways; passenger cars only means, well, passenger cars only, and a motorhome ("house car" on my registration) is not a passenger car. The only exception to this that I know of in New York state is the Lake Ontario State Parkway, which does permit non-commercial RVs and trailers that are not too tall. In many cases, a class C motorhome simply won't fit underneath the overpasses on parkways.
It's not just the overpasses (although having lived and worked in the Hudson Valley for decades, I've seen my share of tall vehicles stuck at them and having to be backed out and down entrance ramps). There are basically no shoulders, often rock faces, and no medians (just a very short guardrail) on most. The roads were designed as scenic drives for cars and are not at all suitable for an RV.
I can recall a time where even light pickup trucks weren't permitted on any of them. That did change over the years, but I believe there is still the restriction that if you have commercial plates, you can't drive a pickup on them.