Get a vehicle tune up a few days before you leave for Mexico.

There is always a chance the mechanic performing the tune up could forget to adjust something correctly.  But if you get the tune up done a few days before your Mexico road trip, you will be able to drive your vehicle around for a few days at home to make sure everything is running properly.

Also make sure your spare tire is in good condition and has the correct air pressure.  Check to make sure your jack is functioning as well.