Yes, the newer refrigerators (and usually the double door models only) have a little heating element in the door frame to help prevent this. They usually have a little toggle switch up above the freezer door to turn it on/off. You'd want to turn it off if you were dry camping without electricity.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR