ibcarguy,
Before going into Baja be sure you have the following:
1. Mexican car insurance but buy it before you get to the calif./baja border crossing, trying to buy insurance right at the border is a zoo and frustrating. Check with the Bagabundos Club in Rio Vista calif. Your american regular insurance won't work when you are in Baja. Check with Good Sam about being able to use their Emergency Road Side service policy when in Baja.
2. have your registration and pink slip or if still being financed, a letter giving you permission to take the car/rv into Baja. This requirement might have changed.
3. If possible, your doctors prescription for all drugs/prescritions that you will be taking across the border.
4. DO NOT bring any guns of any kind or ammunition into Baja or Mexico.
5. When leaving Baja at the border make sure any locks on your RV are unlocked. Be prepared for questions by the U.S. border patrol guards like "what country are you from". Be sure you and your wife verbally practice your answers. The gurards will some times ask your wife to step to one side of the vehicle and you on the other. They want to check if both of you are giving the same answers. Do not hesitate in your answers. The guards have absolutely no sense of humor:(.
6. Be sure and give your car/RV a complete maintenace check up before leaving and replace or repair any suspect issues or repairs BEFORE LEAVING.