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What was the old A/C make and model? Not sure I fully understand the "90 degrees off from my RV vent system" here. Please explain that more fully.
I have never heard of such a thing.............these are either a direct ceiling discharge or a vented unit. It sounds like they ordered the wrong unit for you. That number they sold you won't line up with the old ductwork. There are still a few of the older style 59516.531 units left. That is what you need to keep this lined up properly. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.