Your '91, like my coach has 4 separate split unit basement airs. I have 2 compressors stacked in the left front bay, 1 in the second bay on the left and one in the center of the coach in the bay behind the door. Until they fail they are good units. There are sources for most of the parts and they can be worked on by the same folks that work on home AC units if you can convince on that they really are the same.
I have three of them on now. I only use the 4th unit when it is REALLY HOT!
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