... I have looked and looked for the website for the 1/2 thickness granite I read about it in the FMCA magazine. I tried the site given in the mag and got no response, so suspected they went belly up like so many other RV related companies have. ...
The company discussed in FMCA, FlexStone, did in fact go out. The guy ended up being a good personal friend of ours, and it was tough to watch him have to declare. Another victim of the industry collapse that took out Country Coach and Monaco (his two biggest customers, not only for granite, but also heated floors).
That said, I can tell you that he did not manufacture the material; it is actually made by a company in Italy, and I believe it is still available. That's the stuff backed with epoxy resin over woven roving. The aluminum-backed stuff is also still available and commonly used on yachts, but I don't have the name handy. You might have to do some research to track these companies down; most granite installers will never have heard of them.