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I did the heavy Dynamat as a first layer in the doghouse and anywhere I could stick it on the underside of the floor while being under the rig by each front wheel. It’s basically a 3/8” layer of tar/rubber. So it stuck to any and everything, and it’s irrelevant if it gets water on it. As an additional layer in the doghouse, there was room for the Dynamat 3/4” foam padding as well. We were considering wearing earplugs before, and if you were barefoot and touched the doghouse, you almost got burned. I wouldn’t say it’s as quiet as a library now—but it’s almost unbelievable how much cooler and quieter doing that stuff made it.
Luckily for me, this was the first “project” I elected to do myself. My wife wasn’t too keen on me “modding” the RV for fear of warranty invalidating and a not verbalized lack of confidence in my abilities. Doing this was such a win, that she became my greatest supporter finding other areas to improve.
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