You may want to double check that the ac prep includes the thermostat control wiring. It usually does not unless Montana-Keystone has changed this in the last couple of years. The thermostat will support the second zone if the thermostat control wire is there. On our factory installed second ac, it was also equipped with an additional sensor for temperature for the second zone. This also need to be in place. If you don't have these installed and don't want to fish wires, then the second ac needs to have the controls on it.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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