Can registration information on commercial trucks that cross the Mexican border be obtained by sending a NLETS transaction to MX?

No, registration information on commercial trucks crossing the Mexican border cannot be obtained by sending a NLETS transaction to Mexico. NLETS (National Law Enforcement Telecommunications System) primarily facilitates communications among U.S. law enforcement agencies and does not extend to Mexican authorities. To obtain such information, one would typically need to work with Mexican authorities or relevant agencies that manage vehicle registration and border crossing data.