-Even the most restrictive jurisdictions can not prevent you from from traveling through the city/state with firearms that are legal where you came from and where you are going as long as you don't stop besides gas, food, ect and it is secured in a trunk or otherwise inaccessible. I believe this is a federal law, right to travel or something.
My plan is to travel with a 12 gauge shotgun and a 9mm with 10 round magazine as to be legal in as many states as possible.
From Wikipedia:
The New Jersey State Police observes federal rules under the Firearm Owners Protection Act (FOPA) and has provided guidelines on its website concerning the transport of firearms through the state in accordance with FOPA.[6]
However, many local police departments in New Jersey do not recognize FOPA and have been known to detain and/or arrest out-of-state travelers who are traveling with their firearms properly secured IAW FOPA. Similarly, some local prosecutors have been known to press weapons charges against travelers transporting their firearms through the state IAW FOPA.
It is advisable to avoid travel through New Jersey whenever practicable.[7]