I have always been told that the best one can expect is 20 degrees cooler than the ambient temps. In 115 degree heat that would be 95 degrees inside.
Make sure that if one of your ACs overheats and trips a circuit breaker that your refrigerator/freezer is not affected.
I have been in campgrounds in extreme heat and the circuit breaker trips at the power pedestal outside. If I were you I would remove all of the food from the refrigerator/freezer when you leave just to be safe.
Tuga & Karen Gaidry
2012 Honda Pilot