Like Doc posted, weep holes in the lower window frame make the noise. A quick test is to drive a few miles at highway speeds to get a noise check. Stop and put tape over the cotpit window weep holes on driver and passenger windows. Drive a few more miles and see if the noise has gone away. This problem has been around since the weep hole design was implemented. There are covers you can buy. What I did was put black electrician tape over the front holes for each window. I put the purchased covers on the rear holes. This has worked for me since my first coach in 1978.
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Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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