It helps if you reduce the cooling area inside the coach. Leave the slides in. On our Vegas 24.1 we also use reflectix to block heat from coming in through the the front windshield. To further reduce the cooling area we hang thick blankets from the overhead bunk to completely block out the front cab area further preventing heat from coming in from the front. Other steps include stuffing the foil insulated vent pillows into the ceiling vents. Refliectix in the sun facing windows will also help.
It looks like the AC is centered over the bedroom area in your rig. If you could create a thermal barrier such as a curtain to hold the cold air within that space your AC should be more than adequate keeping that small space cool for the pets to hide out in.
During our trip along the gulf coast last summer we experienced days over 95 degrees that overwhelmed our AC capacity until we learned all the little tricks to keeping things cool.
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