I used a layer of Dynamat Extreme topped with Dyna-Hoodliner to cover the inside of the doghouse cover on my gas Class A and it helped with interior noise level considerably.
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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