Let's be honest, shall we? (Edits in red)
This adds nothing to the debate about whether it would be prudent to transport legal objects through any particular jurisdiction on the off chance that you might have contact with a particular police officer there who has a hate on for people who possess that legal object, but this is why the NRA has a Civil Rights Legal Defense Fund - DefaultCivil Rights Legal Defense Fund - Default. Unfortunately, they aren't big enough to help everyone who needs it, and most people I've spoken to who contacted "the NRA" for help were talking to the subscription department, or NRA-ILA.
I am leery of advice to retain a lawyer in advance "just in case", not being in business or anything, but there seem to be more and more lawyers who are savvy re: Firearms law, and maybe, especially if traveling, it might not be a bad idea to pay one a retainer...