We took delivery on a new 2014 Sunstar recently and have a great deal of wind noise (driver side of the MH window) Took it in to CW and they were really perplexed by it but said they would work on it....
You might try moving your side view mirror closer to the side of the motor home. You do this by adjusting the arm. There will be covers over screws where the arm connects to the body of the motor home. Pry the covers off, loosen the screws and adjust the arm. This worked for me.