I have water leaking in my Class A on the side where the awning is. I have sealed the roof and all the other items on the roof. So I believe it is not coming from the roof. The only thing I can think ...
I'm presuming you have a drip-type leak from the awning down the side of the motorhome? If so, do what I did: locate the area of the leak and pump some silicone along that seam just in that area. It stopped mine quite few years ago. Of course, you must leave the awning extended until the silicone sets up. Maybe a full day or so. (Do this while weekend camping!)