Our 2015 30DS doesn't have any 120v wiring up there, just 12v wiring for vent fans. I've recently took down the shroud last weekend and cut out the foam to install a ducted AC this spring. From what people have done in the past, they've routed the wires through the ducting to the back wall, then over to the closet and down to the electrical bay. If you happen to have the Atwood AC unit, they say you can run 2x13,500 units on a 4kw gen. I don't know how reliable it would be at high altitude/high temps. For now, I think we'll be going with an Atwood 13.5 ducted unit in the rear and see what sort of amp draw it actually shows. Then maybe, we'll swap out the 15k Domestic unit down the road if we think it would actually run on the 4kw gen set. Would be nice....