Timmo! wrote:
Small dehumidifier will offer you excellent protection. And we live in the PNW where mildew thrives like a king.
yup, and it sounds like the OP has power to the trailer so my suggestion is to go to big box store and buy the smallest real (compressor driven) dehumidifier, turn it on low and maybe on a timer, and use the optional drain tube to drain water outside.
And IMHO one of the worst things you can do is cover the trailer with the blue (or silver etc.) plastic tarps. They don't breath and capture moisture.
The best thing to do is cover the trailer with a RV cover, they are breathable so moisture can escape through them.