We use a 20 foot long 14 foot wide Aluminet 70 shade fabric on the side opposite the door. We park the trailer with the Aluminet facing the south and this allows us to enjoy the awning on the north side. Keeping the side walls in the shade does help reduce the heat load.
I have 1405 watts of solar on the roof and used 3 inch or higher brackets to allow for more air flow between the panels and the roof. I was able to replace my 13500 air conditioner that pulled about 15+ amp with a 11000 PS (power saver) version that pulls 9.3 amp instead. This allows the solar to run on the inverter/solar without a generator.
I agree that that mold can be an issue depending on the environment where the trailer is used. Fortunately the Great Basin is extremely dry and we don't have problems with humidity.
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Jeff--
Arctic Fox 22G w/1440 watts solar/GMC2500HD Double Cab with Leer Cap w/740 watts solar
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