If it's working well for the 6 hours, then the Freon charge is good. Outside high humidity will get inside a pop up easily, and it'll freeze up. Try it on high fan, and let us know exactly what happens.
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2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
1 Spoiled Dog
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