story identification - What book was a post apocalyptic, nuclear-age, old world war style

I read a book about 5 years ago that was a post-apocalyptic, nuclear age, maybe a World War III type book. I remember that there was a lot of radiation disease and that there was some guy with a stash of gold that was radiated and it killed him. I think the main character was a former soldier or something. It was a pretty old book. Does anyone know what I'm talking about? Oh! It was based in Florida, and the guy drove to Orlando at one point. I remember that because I live there.