So your refrigerator is holding a 62-degree delta below ambient in the living space of the trailer (and as Gene said, perhaps even more of a delta from the heat-exchanger compartment.) I wouldn't want to be in the trailer if it's over 100F inside, and at 100F it could probably maintain 38F or better in the 'fridge, if it maintains the same delta. That's not too bad, really.
The 122F you measured inside your trailer makes me feel much better about what I spend every month to keep a roof over mine!
Zero Gravitas ó 2017 Flying Cloud 26U | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. ó Sir Winston Churchill