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Well Gab, there are several places that sell kits for this purpose. http://www.dynamat.com/ is one of them. Other folks can probably add to this. You can get catalogs from some of these places. You might try this web site and take a look at some of the products. If you want something a little cheaper you can go to to a fabric store and buy foam and stick it on your self and there are other materials also. I've read that by strategically placing strips of foam in certain places will make a big difference,
Dynamat is a good option, like mentioned above. It is a little pricey, but well worth it. And I don't think it will hold moisture like other products. Stay away from anything that will hold moisture, easrly Mustangs used a material that tended to retain moisture, I know, I've dealt with this on my '70 Mustang. The material on the doors is asphalt type material, you can scrap it and replace it with a piece of Dynamat, it'll be much better. Add some to the floor, rear cab panels, and roof, it'll help. Nice thing about Dynamat is that you do not have to completly cover the whole cab. There are also knock offs of Dynamat as well, and a little bit cheap I think.
I think anything you do has to help. I used a cheaper alternative to Dynamat called Fatmat http://www.fatmat.com/. It was much cheaper, so I covered the ENTIRE interior of my 1934 Ford truck cab. I also used it under my fenders to prevent from starring the paint. So far after 1 summer on the road, no problems with it not sticking to the roof (which was a real concern to me).
Good luck
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