I have had the windshield leak on every MH I ever had - hardly a comprehensive sample but persuasive to me. Personally I think it’s because that huge hunk of glass has absolutely no flex whatsoever whilst the frame and front cap (class A) has quite a bit. It seems destined to fail. I use windshield seal and it fixes it every time. It’s great stuff, like really thin and runny silicone that flows where the water goes and then sets up like the regular stuff. I use it on my side windows as well and for the same reason.
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