Shall I cover my travel trailer during winter time?

I always stored our popups in my workshop but when we moved to a hybrid I couldn't so the first winter I rented indoor storage. That was costly so I invested in a cover for the following winter and have since used a cover for winter storage on every trailer we've owned after that. I use an ADCO Designer series on our current trailer and wouldn't ever consider not covering the trailer for the winter, not so much to keep it "purty" but to protect the seals and the awning from the constant freeze / melt cycles over the winter. Installed properly, there's no reason at all for a cover to rub or damage the finish of the trailer.