Thanks Guys!
The reason I ask is that I just bought a 72 Blazer CST, though I don't have it here with me because it's got a fried wiring harness and a new one is being installed at a garage in Salt Lake City. As soon as that is done, I'll fly there and drive her home to So. Cal., then show her the tender loving care she deserves. At the moment, I'm just trying to learn as much as I can about her and the single/double wall top thing was confusing to me.
Here's a picture of her:
