Honestly? I don't do a thing... I fill up the tank before I park it and simply start it up a couple of times during storage. I let it warm up real good (20 minutes or so) and shut her off. I have never done anything special to any of the show cars I have had and have never had a problem with any of them when getting them out of storage... Plain and simple... I just put my truck away last weekend and, if I wanted to get it out and drive it on a nice day, I could.
Mark