I installed a second AC unit in our previous coach, a 29 foot Thor ACE. As Clyon51 said, the ceiling vent hole is a standard size BUT you should check with the manufacturer for roof loading. A typical 13.5 AC unit weighs in excess of 100 pounds. If the coach is not prewired, you'll need to run a 20 amp 120 volt line, and most units need 12 volts as well. I used surface mounted plastic wiring channel, not very pretty but a whole lot easier than pulling cable through the walls. The simplest installation would be to install a 20 amp breaker box and run a drop cord from the 20 amp outlet on the campsite pedestal to it.
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Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2018 Honda CRV . Full timers since Jan 2012.
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