Our 16 Montana has the big Norcold 18 cu ft rv fridge and so far it has done very well on 2 round trips to Myrtle Beach at 40 hours each. I do think it uses a lot of energy and propane while going down the road. There are 2 fans inside the unit and at least 2 outside for the cooling fins. The burner sounds like a jet engine but I don't know how big the flame is. When running off the battery and not connected to the truck I don't know if it would last long or kill the battery quick. We do not boon dock so on a/c it does fine and DW loves the space it has. Bottom line is if it ever goes out I would look at a residential unit because this thing is $4k to replace and that will buy several nice residential units.
