masterplumber
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You might try some peal and stick flashing material from Home Depot for the road noise if you're not planning to insulate. Pretty cheap and does a good job of cutting down on the vibration noise from the large metal panels. And it's thin enough if you want to do something later you can just go right over top of it. It's usually in the roofing section. Works like Dynamat that the stereo installers use, but much much cheaper.