The guy who owns Stockton Wheel has a really cool '56 Ford stub-nose flat bed truck that's been hot-rodded. (lowered, chrome Alcoa wheels, etc).
He actually uses the truck, too, and what he did for the flat bed deck boards was used boards made of recycled rubber. Not only can you not hurt them, but with tire foam they look brand new, stuff doesn't slide on them, and I would think all that rubber is going to quiet down the truck a little bit.
I don't know where he got them, but they're readily available for the commercial truck industry.
Might point you in the right direction.
Brad
