If you have a car cigarette lighter type outlet in your trailer, you can probably get away with something as simple as this for charging devices if that is all you want to do. I use one with a 100 watt suitcase when boondocking and it works fine for charging devices.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Jonathan
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2013 2922KS, 80W solar panel, awning, AC, front window, over stove/sink cabinets and wardrobe.
2014 Ford Explorer with tow package, Tekonsha brake controller, Reese WDH, Renogy 100 W portable solar suitcase, modified for 7 pin plug. (Our battery is up front, under sofa). Modified to fill hot water heater and fresh water tank with unit closed.
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