Upon buying my 2003 3670RL Montana fifth wheel, they said the 2nd AC was wired also. About two years later, I went to install the AC and the dealership (that sold it to me) said it "wasn't wired." I endured a lot of hot weather until about four months ago when I decided to check the wiring potential out for myself. Due to the curved aluminum framing and the flat ceiling, I was able to fish a 12/2 wire from my panel to the vent. I had 50-Amp coming into the trailer panel and, with some studying and re-positioning of one wiring, I MADE room for another breaker for the 2nd AC. I just came back from some very hot temperatures in Myrtle Beach, SC and the two ACs worked great. They cycled as they were supposed to while being set at 74 degrees. Good Luck!
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