Sound deadening

Talk to NVH engineer. He told me that Dynomat works but only when applied to sheet metal. Since I don't think there is exposed sheet metal inside the RV, it won't work. Most of the road noise should be coming from the wheel and wheel well. So, adding coating like Lizard skin should help. He said that formulation of the coating does not really matter. What makes it work is that you are adding mass. So rubber based coating would not necessarily be better than other ceramic based coating just because it is rubber. Also adding shoddy pads inside the RV near the wheel well will do most good. There are tires that would make much less noise but I am not going to swap out a almost new tire with a new one. So I will look into getting my wheel well sprayed and will add some shoddy pads where ever I can . Also, you read my mind... When I tried out the heat pump, it was so noisy I decided never to use it. Not sure if my RV has Mach 8 but will check it out.