Should I cover my tires?

op wrote:
Getting ready to cover the trailer for the winter, and I'm wondering if I should cover my tires. They're not in bad shape.

You can follow what tire experts like Roger Marble who is a actual tire engineer and a rv member under the user name Tireman9 https://www.rvtiresafety.net/2011/06/tire-covers-do-they-do-any-good.html tire blog or opinions expressed on the net.

andtire covers

You may also want to google what your tire mfg has to say on tire storage/tire covers subject.