I’m so glad I got out of the family 4th of July trip to my sister in law house in Maryland. I do not miss nothing in them states up north.Id fly w/gun, avoid all that crap and rent a Car.
ALL of NY is bad, NYC is just the worst part. MD, Wash DC, DE, NJ, MA too. Since its your butt on the line, you should confirm "what's allowable" and print it, keep it in the vehicle.
When I last checked, most on line info was old/dated and new anti-gun laws pop up like weeds. Even the main sites said contact "the States Attorney General or State Police". That still doesn't get the info from counties and small town mine fields.
Understand you have FL plates and are generally driving on a major illegal drug corridor. Profile stop, maybe?
The basic protect is in: 18 U.S. Code § 926A. Interstate transportation of firearms. Note that it protects firearms (by a specific definition), it mentions ammo BUT states nothing about "magazines". Many locations have rigid mag/capacity Laws which could be interpreted as outside the protections of the Law. NY has an exemption to "the peaceable journey law" maintaining a Class D Felony for transporting a high capacity feeding device (NY S265.10).
You must know each States legal definition of "destination" as it applies to their enforcement. Stop at a amusement park or anchor in the harbor: that's a destination and not direct thru travel. Gas/food along the route is okay. Stop at a Aunt Jane's, no good. Hotels/motels are gray areas especially if you move firearm between vehicle and room.
Here is an example, the N.J. interrogation: https://www.njsp.org/firearms/transport-firearm.shtml. Plus, if they tag you for the gun you get additional Charges for over 10 mags and hollow points.
I wish you good luck and a smooth trip.
gotta be careful what u think out-loud... there are laws against thinking out-loud...
rich