Note, my '06 Monty "prewired A/C" option only has the AC power wire. There were no control wires back to the thermostat or an easy way to tap into the existing ductwork. I hope things are better in your rig.
You can certainly run the control wires or create the ducting, but for me, the plan for my 2nd A/C is an independent drop in unit.
I'm only suggesting you check what you have since rigs may vary and you can use what you learn to ensure if you have this done, you don't get overcharged for items already there or end up with an independent unit if an integrated unit would have worked. Another example, you might not want another Dometic.
Whatever happens you'll love having a second A/C. Just make sure the power supplied supports 50 amps.
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