Technical Support wrote:
The temperatures listed are well within our recommended storage range, typically 32-140F. Dust can be a concern, and if it gets heavy where you are, the cloth covers should be fine. I doubt the humidity in Oklahoma would get so high as to be a problem, especially if the equipment is stored and used in the same environment. Going from cold to hot can lead to moisture build up, which should be allowed to dissipate before use.
I have never seen a light stand corrode, though I can see it happening if left in the weather for a while. In a garage is no problem. A desiccant would not hurt to keep with your fabrics, but would only be necessary if gotten damp from use or humidity, then stored before drying. However, I can see storing white fabrics in a hot environment may accelerate discoloration (we have no absolute data on this, but it would not happen immediately).
Thank you for the response and information. Good information about the white fabrics that I hadn't thought about. Hopefully, the forum has users who have stored their equipment in the garage and can add their experience. Thanks again.