trucks do not belong in the left lane

It depends on what state you are in, Arizona you better get out of the way cause that truck/RV can roll in any lane and the maximum posted speed limit. Now in the socialist republic of Kaliefonia vehicles with 3 or more axles or towing a trailer even if it is a passenger vehicle towing a Sea Doo are restricted to the right 2 lanes of travel and must remain in the right lane unless passing except highways with 3 or more lanes of travel in one direction and then you may travel in any of the 2 right lanes except where posted. Even more fun is in Kaliefornia you are restricted to a maximum speed limit of 55mph for vehicles towing trailers and 3 axles or more, including that car towing his little boat.