Well I use the Camco that takes 1 D battery and I believe it makes the fridge more efficient especially if it's full. That Dometic in the link reminds me of a time I saw a freezer using a computer case fan, those are 12v and at first glance seem quite similar...reason I'm mentioning is because used comp case fans are cheap and fairly common.
But however it's done count me as one of the "think it's a real good idea people".
TV=2009 F150 FX4 Supercrew, 5.4L, 3.73., air bags.
TT=2016 Jayco SL 273 Toy Hauler