If you do not have a tight, snug fitting cover, the wind can cause the cover to chaf the corners of the tt. It happened to my neighbor's trailer. If the cover fits tightly all over the trailer, then you're good. I had a cover for my old trailer. This one will not get covered. They sit out on a dealer's lot or the manufacturer's lot uncovered. You will find two schools of thought on covering, and God only knows which is correct. I guess it really comes down to personal preference.
2010 Silverado 5.3 3.73 EC Superchip, AEM Air Intake
2013 Jayflight 26RLS
2 Fur daughters
....and empty pockets