Floor covering in the cab makes a big difference. The base vinyl floor is durable and easy to clean, but doesn't do anything for noise control. I've noticed in recent years, RV makers stopped ordering the optional cab carpet, and instead throw some house carpet remnants over the cab vinyl. Dynamat will work for this noise. If the road noise is coming from the house, I'm not sure how to help that. The house's wind noise will also be difficult to control, although there' are some tricks which might help a little, such as mini-spoilers, air-tabs, gurney flaps etc. Even just some tape the edges the noisiest windows might help.