Having recently taken delivery of my new Jayco Eagle, I noticed the bench above the fridge got quite warm to the touch. My local dealer showed me how to check the insulation at the back of the fridge compartment, and in particular to check that there was a strip of aluminium insulation tape installed at the top of the fridge to prevent the heat getting in between the fridge and the bench. Sure enough the tape was missing but was an easy fix with some tape purchased from Bunnings.
You can see in the photo I have not only put the tape over the gap between the top of the fridge and the bottom of the bench but lined the entire top of the compartment.
I didn't measure the bench temp before installing the tape but did afterwards and it measured about 35 DegC, which is good considering I live in FNQ. After running the fridge on the highest setting on 240V for 2 days, I measured the fridge temp (4 DegC) and freezer (-10DegC). I was pretty happy with these given the outside temp was in the early 30's and the humidity was quite high. Admittedly the camper is in the garage but even so I thought the fridge did pretty well.