There are all types of sound deadening materials available, especially for audiophiles. If you're talking about a rear engine RV, you could perhaps use soundproofing foam board or sound deadening mats. Use Google to search for 'auto engine soundproofing' and you'll find a variety of strategies, you can decide what you can use in your situation. If you close the door to the rear bedroom, that will cut down on a lot of the noise.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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