I run a diesel dually and pull a 42' trailer.. it has a LQ in it and I carry the latest copy of the regulations just so I can pull it out and have the person(cop) show me(I have the pages with a tab on them to say what is and what isnt legal for me and my rig.. so far I have never been pulled over.. but I am legal and I keep my rig clean and always check my lights daily if I'm using the rig