A friend of mine made his own sound deadening floor mat for a spray truck and said it made a wonderful difference in the cab, and it's a nice floor mat. he used the diamond pattern one
I want to try some in my truck soon.
http://www.cabinsulation.com/floormats.html

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-