I've got my AS in covered storage with the fridge on with AC. It's about 82F inside the tailer. The fridge is on setting 5 and the fridge temp is about 32-33F. The fridge is empty.
I was able to look up the chimney but couldn't tell what was immediately beyond the condenser fins. The wall baffle seems to be built has high up the wall as the condenser.
Inside the trailer I can feel the side wall where the TV is mounted next to the fridge and its warm. You can run you hand up to the ceiling and still feel the warmth. Moving my hand towards the front top of the fridge the warmth dissipates. The panel above the freezer feels warm but not like the wood adjacent to the chimney so I don't believe the space on top of the fridge is open in the back to the chimney area.
I'd love to learn what is up there. I think they could've built a shallow cabinet like they have under the fridge. This youTube video shows a 25' AS Flying Cloud with the rear dinette and couch and it has a little cabinet above the fridge.