And no you can’t pigtail off the thermostat, IF you were even able to add the third unit you would either have to get a third thermostat, get an AC with ceiling controls or get a multizone thetmostat and do all the modifications needed.
Roof units used In multizone applications are wired differently than “standard” units. Your looking at a daunting task, if you have an unused circuit you could use it for your third unit, with ceiling controls or get another thermostat and run that wiring.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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