Anyone know what the laws are or where to find them?
I don't know anything about transporting reloading components, but I do know a bit about FOPA. Here's my advice:
-Know the laws, and follow them. Keep copies of the laws with your lawfully secured guns as insurance against felony conviction.
-Don't mention the guns if you get stopped.
-When you're in Connecticut near the NY border, stop and gas up, as this should get you all the way through New York, New Jersey and Maryland to the free states. Before getting on the road again do a walk around the vehicle(s) and make sure that all the lights and gadgets work like they should, and that you don't have a bumper hanging off of your car or anything else that will draw attention to you. Then do a visual inspection of the interior of your vehicle from the outside to see if there's anything weapon related in plain sight that could be seen during a traffic stop. (Repeat this process before going through other anti-gun states).
-Coach your passengers in the fine art of not blurting stupid sh** to cops if you get pulled over (like "Did you tell him about your guns!?!"), especially if you have children.
-Buy, beg or borrow a GPS in addition to printed directions. Either one can fail you, especially if there's an accident, construction or whatever other unknown confusion.
-Check the laws of the states that you'll be passing through to map out where you have reciprocity and
carry a gun while passing through there. It's a PITA to load up in free states and disarm in anti-gun states, but it's worth it.
-Pay attention when you're driving, pull over to sleep if you must, but trust your instincts.
-No really, carry a freaking gun or two where you legally can. When I moved from MA to FL, I was asleep in the backseat and the person driving got us lost somehow, so we had to turn around. I woke up groggy, and 1-2 minutes later (while I was still rubbing the sleep out of my eyes) a team of people on foot and in a vehicle tried to carjack us; they had a good setup but we saw the cues and foiled their plan. We were a car packed to the brim, occupied by people with out of state plates and the wrong color skin in a bad neighborhood, a prime target for crime. If you're pulling a trailer you'll be even more noticable and less able to drive like Frank Bullitt.
If you want a good source, go read NRA's summaries of state gun laws to get an overview of each state's laws.
Good tip, but keep in mind, even the NRA doesn't get all the gun laws right on their website. It'll give you a good idea, but don't trust your RKBA to what they say.