Hand guns, lol get a shot gun and cut to length. No need to be real accurate to get someones attention.
No matter what the law reads you will always have the chance the cop just does not know or does not care. Traveling is such a broad term anyway. But I am no law office understanding person, got pulled over for tires too wide once. Had to wait 45min, while the cop looked through the book.. I tried telling him its not wide law, its how far off the body lines. Still took 45min. to get told, Iwill let you off this time. LOL