They also make a product designed for roofing, that's essentially a rubber backing, with reflective foil, and adhesive.. It's usually only a couple bucks a roll, and comes in strips..
I've done a couple cars/trucks with it and it really helps reduce the noise/vibration and increases the insulation..
Home Depot carries it, they also have an inexpensive outdoor carpet that's pretty close to OD, and outdoor carpet padding inexpensive as well... Cost less than $100 to do my CUCV, I plan to do the same to my M934... It went from a rattle can that you couldn't have a conversation in, at anything above idle, to being able to hold a somewhat normal conversation @ 60 MPH.....
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EDIT : Below is not my pic...
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