The nhtsa defines a pickup truck as a multipurpose passenger vehicle. This is what they require it to be identified as-
Therefore, a ram is exempt from the New York law. EVEN IF the door sticker said “passenger vehicle”, the rear window on a ram is not in a “movable closure door-like member” (liftgate on a grand Cherokee, for example), therefore, STILL not required to have a rear window defrost. I’m not doubting that you or your buddies had theirs replaced, but don’t expect FCA to just start replacing everybody’s rear windows who owns a tradesman in the state of New York. They don’t have a leg to stand on to be able to enforce that law on a ram owner.