In our 2012, Airstream built a box behind the refrigerator to aid the airflow only over the coils, and not just floating around in a large space behind the coils. I have a blog entry that might help give you some information, remember there are a few years between our trailers.
However, I don't feel it is a problem seeing the daylight at the top of the refrigerator. By that time the airflow has already passed over the coils. Look from the rear to see if you have a box close to the back of the refrigerator. Maybe get a mirror to see if you can see up the back of the refrigerator.
Removing a refrigerator is not too hard of a process. You just need to disconnect LP, 12VDC, and 110VAC. Some screws in the front, then a couple of bolts in the back. Then some muscle to take it out.
Hope this helps.