Wheel covers for outdoor storage in winter snow

EldIr wrote:
They're open in the back so moisture shouldn't be an issue. I keep them on my tires at all times except when using the trailer.

With covers on even though they are open in the back snow swirls up and fills the space between the cover and the wheel, packs around the calipers etc and then freezes and thaws throughout the winter resulting in rust. When they are uncovered the snow blows through.