It shouldn't be hard. The ducting is just styrofoam and, at least on my trailer, the second AC sits right in the middle of the existing ducting. I didn't feel like waiting on a ducted unit to be ordered when I had the second AC installed (I think it would have been ducted from the factory, but the dealer forgot to order it), so mine isn't tied in.
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2015 Chevy Silverado LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition
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