In you travel interstate, remember that we are a nation of laws, poorly written and randomly enforced (Frank Zappa) and that our firearms regulations are a particularly crazy quilt. Not only that, but I suspect that many cops have no idea what the laws are, and don’t care particularly, and are willing to improvise if they dislike you. Keep your artillery out of reach, unloaded, out of sight, and in a locked, hard case, not a soft case with a trigger lock. If you have a hunting license, keep it with your driver’s license. Ditto your pistol carry permit. A pistol carry permit is still pretty decent proof that you’re not a lethal whack job.