I've always wondered about those that have a full size spare. I'm guessing that is just for trail use? If I get a full-size, I think I would just have it up there when I'm wheelin', as the temp tire should get me somewhere to have it fixed, as long as it's not too far and I keep the speed down and I'm driving on pavement. For those that have a full-size, do you throw it in the mix for tire rotation? It seems like it would be good idea, as if you get a flat when all the tires are nearing replacement, it probably wouldn't drive too well with one brand new tire. Also, all tires would get use, making the set last longer, and one tire wouldn't be constantly subjected to the sun as well as never getting used. As far as tire covers go, you may want to check a RV supply. They usually have them cheap, but they are usually all-white to keep the temp down. Logo'ed tire covers let you personalize, but you may want to consider alternate colors other than black, due to solar fading, and deteriation of the tire, especially if you leave it up there street or trail.