Here is one site you can check about exporting a vehicle to Mexico, through New Mexico. My son-in-law has legalized several vehicles and a motor cycle going to Mexico through Arizona. Same rules apply through all states. He finds it very easy. The site does say the rules apply to Mexican Residents only. It does not say Mexican Citizens only. I might add that my son-in-law is a legal U.S. resident and a Mexican Citizen and also has a home in Mexico. The last vehicle he brought to Mexico was a convertible.