There are a lot of things in our rigs drawing power even when off. Some have been mentioned above, but the TV's, antenna boosters, and thing like that must be unplugged or they continue to draw juice also. Without having a solar source to recharge the batteries, I'm with the majority, don't do it. Not only will your food probably spoil, running your batteries dead will damage them also.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.