"...I would forfeit my fridge contents after 6 hours or so..."

I think you may be jumping the gun a little there. We live full time in a RV, moving a lot. When we are on the move we turn the propane off to our refer, often for eight hours or more, with no ill effects. Ice cubes in the freezer are still frozen, stuff in the 'fridge is still cold. How long food will last in a 'fridge with the power off is governed, at least to a certain extent, by how often you open the door. Fridge's are well insulated, and will keep food edible for several days, as long as you don't open the door every 15 minutes...