Originally Posted by iridehorses
When I lived up north, I knew one or two people who covered their steel trailer and it seems to have created more problems then it solved. The covers would hold the condensation in rather then allowing it to evaporate and it seemed their trailers had more then the usual amount of rust.
You do want to make sure the cover or tarp doesn't go all the way to the ground and is loose enough so that air can flow around and under it. Otherwise, you're right...you'll trap a lot of moisture under it, even in a stock trailer.