Only time I had a wind noise was when the side window wasn't closed tightly in it's channel. On one coach the window didn't fit well into the channel and leaked air a lot just because it wasn't completely closed into it's channel.
The other suggestion ,as above, get some wide painters or masking tape and tape up all the bottom rails of the window on your next trip. If it doesn't help, remove the tape and tape up the vertical rails, keep going until you find an area that helps.
2019 Fleetwood Discovery LXE 40M w/2012 CRV toad