We use a 50QT ARB 12vDC portable fridge, and have not setup the Model S for it yet. The powered cooler is superb FWIW. No ice needed, and when you get to your destination, you can plug it into AC power. Perfect for beach weeks, etc. http://store.arbusa.com/Fridges-C11.aspx It is very thrifty in terms of energy (Average DC power consumption: 0.7 to 2.3 amp hr: typically drawing an intermittent 1.35 amps per hour from a 12 volt power source). I would need to put a 12vDC power outlet in the trunk, or I could perhaps jump the power off the battery and set it in the frunk if it would fit. I am a little leery of tapping the diminutive 12vDC battery on the Tesla though. Can anyone share insights with setting up fridge freezer or powered cooler for occasional use in the Model S?