John, thanks for useful links on gel coat maintenance.
No one would argue with you on carport / barn storage. In fact no one even asks that question. Yes, being close to big city does take a toll in restrictions on property structures.
As of tires, I am not sold on covers. Yes having them is a good thing. But generally the car tires last for 8-10 yrs no problem without any covers. So it may be an overkill if you have so many things to do. Damages from the road will likely kill them, and you DOT ask to change tires every 10 yr anyway. 🙂 Can you post picture on your setup for keeping trailer off the ground?