Just in case you overlooked the obvious, we run the TM external fan when it is hotter than 85. That helps. If the sun was on the street side of the TM, I would be inclined to find a way to shade the area where the back of the fridge is, but not cover up the vents.
An additional fan might be helpful. Computer case fans are, I think, 12 volt fans. These fans run between 5 and 12 dollars.
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