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I have come to the conclusion that it takes multiple improvements to get the a/c's to work properly. I installed 2- 1 1/4'' pvc pipes 9'''s long in each return air to open them up. I installed pvc pipe in some of the a/c vents to open them up. I installed new a/c vents thru out the rv that have the vents more open and trimmed a couple of ducts that were blocking the vents. It's all about circulation and these rv's have a problem with that. I bought my a/c vents from PPL in Houston. If you are expecting the a/c in these rv's to cool as good as a regular home then forget it as there is no way you can insulate the roof and walls as well.
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