There is a law in effect called "Peaceable Journey." Basically it says you may pass through a state in which your firearm is not legal IF your firearm is legal at your destination and your departure. Basically it needs to be unloaded and locked-up out of "quick access." (Locked saddlebag would qualify.)
The other condition for "Peaceable Journey" is that you may not stop in the state in which the firearm is banned. "Stop" seems to mean "overnight stay" although there's some considerable speculation that stopping for "sight-seeing" also qualifies as a "stop." Evidently you may stop for meals and gas . . . The "move along" clause I suppose.
Unfortunately, "Peaceable Journey" is a FEDERAL law and states like to argue "states rights." The issue is far from settled.
That said, and having skimmed across the 89 odd pages of posting here, let me submit this caveat about "unlawful possession of a firearm."
If you're in unlawful possession of a firearm and the Prosecuting Atty. in the jurisdiction in question decides to play hardball, you're going to face more than simply being cited for having a gun:
A Prosecutor will fill a "multiple pleading" which specifies several and all the laws having an unlawful firearm exposes you to.
Besides "possession" and for starters they'll go for "interstate transport." Then they'll trot out "operating a motor vehicle while in unlawful possession." Or "unlawful possession in a motor vehicle." They'll have you blow in the tube for a BAC, and pee in the cup for a urine specimen. If either come up positive -- and alcohol will show up in a urine specimen some 48 hrs after last consumption -- the Prosecutor may file "unlawful possess under the influence."
Besides being arrested, there's a good chance the state will seek to confiscate your vehicle -- not impound it, "confiscate" as in you lose possession/title so they can sell it at auction to raise $$$ for new cruisers and uniforms. If your bank owns your bike, this is going to get really complicated. The bank may file for default on your finance plan.
You'll absolutely lose the firearm.
Bail is going to be steep inasmuch as you're out of state and a potential "flight risk."
There's a catalog of charges they can go after depending how you're carrying this firearm. They range from "brandishing" and "unlawful concealment" to "concealment with intent," "premeditation," and if you're with someone else they may go for "conspiring to."
Lots of states -- by the way -- have similar laws about knives, their possession, concealment.
Depending upon jurisdiction and how you comb your hair, unlawful possession opens the door to a flood of legal charges, both expensive and complicated and potentially exposing you to being forever barred from owning a firearm.
In light of the Second Amendment and "shall not be infringed" it stinks. But the basis for "gun control" in the USA is founded upon "interstate commerce." That's a fancy legal way for lawyers and politicians to say, "We got lines, and you'd better not cross them."