Agree with checking the windshield gasket. It’s an often overlooked but quite fragile joint. RVs flex and move a good bit when on the road and that big hunk of glass doesn’t have any “give” in it at all. It’s really easy to seal with a tube of windshield sealer from the auto parts store. It’s like really thin watery silicone that flows where the water goes and then sets up like regular silicone. I recently did mine and I was amazed how much of the stuff it consumed. I actually did it in two phases allowing the first dose to set up. I was afraid it was going to start coming out where the water came in!
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