Re: important gear storage question
A couple of things to keep in mind here. Theft is one. Although you may not realize it, someone always sees you storing stuff in a car. Heat in the trunk causes humidity. If your reels are disc drags and yo don't keep the drags backed off, this may cause the drag system to lock up (or stick). The fly line isn't in water, so it may also be heating up and cooling unnaturally. As far as the rods, my only experience was many years back with a Daiwa mini spin. I left it together in the trunk for a few days. Upon taking it out, the rod formed a curve in the top end...which never straightened out. Just my 2 cents. Hope you didn't mind.
It's all in how you hold your lower lip...