List for car

drinking water
snack bars

tp or moist cloths
Electric heater
subset of kitchen stuff (flatware/utensils)
coffee maker/grinder
a couple of mugs
a couple of glasses

Meds/toiletries
eye glasses and contacts
Clothes
Shoes
Comforters/pillows
towels
Mexico Books & Maps

laptops
scanner
laser printer
power strips
software CDs
hard drives from computers
DVM: voltage meter
tools
Camera/batteries

important papers plus passports
You need original and one copy of Driver's Licenses, registration, Passport and Birth certificate of all drivers, (and FM3 if you have it instead of Tourist Visa) and a credit card.
jewelery