Creativepart is right. If you open up the RV at night or early in the morning, humidity is absorbed by everything made of fabric inside the RV. When you do turn on the A/C it first must remove all that humidity before it can do much cooling.
The solution, keep your RV buttoned up tight when you need to run the A/C.
There are other possibilities. The Delta between return air into the A/C unit and chilled air exiting the unit should be near 20 deg difference. If that is not happening you must find out why and correct the problem.
When you remove the ceiling unit you see a divider separating chilled air from return air. If that has any leaks between the air sources, it greatly reduces efficiency and performance. Use metal duct tape to seal all leaks.
Keep air filters clean dirty filters restrict return air flow.
Keep the windshield blocked with insulation to reduce the workload on the A/C unit.
Insure the evaporator and condenser coils are clean of debris, dirty coils will greatly reduce the transfer of heat/cooling. Buy spray cans of aluminum-safe foaming coil cleaner and follow directions.
I stress, turn on your A/C early so outside temperature doesn't get ahead of your unit and force it to play catch-up.
That is the main stuff you can easily do.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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