[rollingdownthehighway]

You may be wired for a 3rd AC already, so it may just be a "plug and play". When we bought our 3700LK, our dealer said "most of the new models are wired for a 3rd AC, all they have to do is remove the 3 vent and replace it with the AC unit". We have a sticker next to our LR vent that says "wired for AC" (or something like that I forget the actual wording). I'd check first before you do anything you don't need to do