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Here’s an update on my AC’s. 

The rear unit appeared to be on fire prior to my ownership. Luckily it didn’t burn the whole coach down.  The red circled area is where I believe it started.  I’m just wondering if I should cut my losses with these and change to a mini split set up??  

The front unit I’m going to put some capacitors in and see if I can get that one running.

Yup that's been on fire! I bet it started at the main power terminal block, mine had one of those that was very loose and barely hanging on. Luckily mine was not making enough contact to pass voltage so it never was able to get hot enough to do that. 

I know a guy that can fix that. I imagine as long as the compressors are in good shape it would be easier to fix the existing units, but all depends on what you want to do. How does the rest of the unit look, are the coils clean or are they crusty? Mine was in pretty good shape, indoor coils almost look like they are new. I went ahead and added ports to the units and charged them up and knock on wood they are running good. 

I am not sure how the guys are all integrating the mini split units. I was looking at the inverter compressors with the indoor unit much like a traditional air conditioner, figuring it would have the ability to connect up to the existing duct work and push air upstairs.

I’m game to fix what’s there if it’s doable. Are you talking about your relay swap??

Yes, I ditched the old boards all together and the old thermostats. I now have a commercial thermostat that can handle the two stage cooling, the other benefit is that you will now have the ability to control the A/C's with your phone, as long as you have wifi available. I keep a home wifi unit in the coach all the time so I can connect anytime and operate the A/C's remotely. Also allows you to monitor the temps in the coach remotely. 

It would be nice to be able to check the unit and see if it is working and the compressor is not locked up. Some testing would be required. I am not sure if you can swap the control boards from one unit to the other since your two units are different. I do have a spare board from one of my units. 

Is there a sticker with the wiring diagram on the back of the electrical access panel? Can you get me a picture of that sticker?