LONG HAUL: I read in the paper that the border was opened to Mexico-domiciled trucks. Does this mean that all Mexico-domiciled trucks can go anywhere in the U.S. that they want?

Not all of the provisions of the North American Free Trade Agreement (NAFTA) have been implemented, so, no, a Mexico-domiciled motor carrier cannot simply send trucks across the border and travel anywhere in the U.S.   The Mexico-domiciled motor carriers must apply and receive the proper operating authority issued by FMCSA.  See the main International Programs page (under the Registration tab) for a link to the application information.