The adventure of Mexico is worth the trip. He had some health tips for travel in Mexico. Drink purified water. This is available from machine in most of the cities and towns. Hook up to Mexican water and use it for other purposes, such as showers.
Garlic tablets ward off intestinal bugs.
If your fruit is not served with limes, ask for it. As to vehicle insurance, he recommends full coverage, with minimum liability. If you are going to stay longer than 14 days, you are better off with an annual policy. With it, you won't. Availability varies and it is wise to keep your rig at least half full at all times.