Welcome to the forum
Every RV I have seen with 2nd AC prep is 50A service. There will be 110VAC wiring for the roof unit and 12VDC wiring for the thermostat. You will have the option of ducted or non ducted, just need to remove the “beauty ring” that’s on the inside of the vent and look to the sides for taped up ducting.
You simply remove the vent and place the AC unit over the hole...a little more involved but that’s the basics.
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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.