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I was able to find (another) HVAC contractor that actually showed up this morning and got my SCS A/C system working correctly using 24-volt contactors/relays!  He was able to get both compressors working and ended up wiring it so that the inside fan runs on high all the time (works for me - unless someone knows how to connect up that part.  Early this morning, before the HVAC guy (Jovani) arrived I went to Homey Despot and traded in the Ecobee Essential thermostat to HD for another Ecobee Enhanced because it includes the dongle that adds a ‘C’ (common) 24-volt wire connection.  Jovani said I don’t need the C wire since there is a common on the relay (or maybe it’s on the transformer, can’t remember)… Do any of you guys think I need to keep the adapter for the C wire or should I get my $100 back? TIA Can’t wait to get this unit back in the coach! The Ecobee Tstat works great but I still need to figure out how to connect it up from the A/C unit to the thermostat to the Aquahot unit (24-volt)…

Adrian, glad you are getting it done. If you need any more assistance I will do what I can to help out. Sounds like you are getting very close to having two operating units with updated thermostats.