Yes, it is really dumb how they designed the rear cap so that it created that 'dam' that holds so much water on the roof, and directly on a joint that could easily leak.
When I saw that on our new camper, I immediately applied a 6-inch strip of Eternabond from one side to the other, wrapping it right over the sides. As the joint sealant was still sticky, and the Eternabond seemed to stick like crazy glue, I am hoping that it will be a semi-permanent fix.
Making something to divert the air conditioner water is not a bad idea, but any little shower will still pond water up there.
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