My trailer spends the winter ( summer, fall
and spring ) under a cedar tree, under the Capilano Cloud
, here on the North Shore of Vancouver. You know it's wet here. If I had a choice it would be under a roof, but I don't have that choice.
I have no breathable cover and would never use a tarp.
I have two Dri-Z-Air containers in the trailer ( each is good for about 10 square feet ). I add crystals several times each winter, and dump the liquid collected every week or two. When it warms up, from time to time, I will turn on a small cube heater and crack a window and open the Maxxfan.
All the cupboards are open and cushions etc. are propped up to allow air to circulate. I have no mold in the trailer.
I also have no leaks