Hi TC,
That weather is tough to cool down a trailer. To check the unit:
I suggest you open the plastic damper on the rear unit, some call it a dump damper, as it dumps the air down to the floor. Turn the thermostat to 70 or whatever, I know it is around 90 or better in there, it will be 'calling' for cool. You should have 30 to 40 degree difference in the air coming out of the A/C unit. It is hard to determine if the unit is working when it is pulling in 90-100 degree air, but check it with a thermometer, supply and the return where the filter is.
Give it an hr or so and check it again. You could have a problem with it, but this is a start.
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