I don't do a whole lot of Interstate traveling with my camper (but do a lot though with tire trailers). This info below is just a little forwarning for those traveling thru Louisiana.
You do need to keep in the right lane when on two lane Interstates here. The State Police have publicized they will ticket drivers that are just driving in the passing lane when they should be in the right hand lane.
They have also started enforcing the law that says you have to move over to another lane when you come upon an emergency vehicle pulled over on the shoulder, that has lights flashing. If you cannot move over safely you are supposed to reduce your speed.