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Originally Posted by JLMounce

You can use the paper based insulation that the factory used and jute as a decoupling layer. It won't be quite as effective as some of the modern stuff you're seeing in this thread, but it should help quiet things down without adding the butyl rubber based products.

In this case without that constrain layer though, you're giving up basically any chance to limit harmonic and sympathetic vibrations in the floor pans.

What you could do at the expense of a bunch of weight would be to use a bed lining material on the bottom of the floor pans. That would keep the fumes on the outside and would serve as a constrain layer to dampen vibration.

Thank you!