Add muffin fans blowing over your fridge
cooling coils and it will help your fridge
with being on the sunny side. I use two 12 volt computer 'mufin fans' and pick up the 12 volts at the fridges 12 volt source. I have a switch that allows me to turn them on and off.
It helps and provide more options.
As well the fans over night I allow the fridge to get as cold as possible, typically 38 F. This also helps keep the fridge cold during day time driving.