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Wow 43 looks and no one has this problem with their coach or no one has solved it?

You will find the vast majority of users on this group have coaches that predate quads with roof A/C, not all but most.  My suggestion would be to contact Newell as they are the only ones dealing with this at scale on late model coaches to see if there is anything that can be done. My coach has two basement A/C's and one Newell installed roof A/C, but it's not ducted per se, it just vents directly into the room from the unit as it's not in between slides, it's back towards the kitchen. That would be a bummer for sure if you can't stay cool going down the road.