I recently followed the advice of a member with regard to wiring the 3rd A/C. I tracked down the power share box and separated the bedroom and middle A/C circuits. I then removed the wireing for the washer circuit (will never use it) and replaced it with the middle A/C’s wiring.
All three A/C’s work at the same time without any issues. We can even run the built in vacuum at the same time.
Total time took about 2 hours. It took me a little while to find the power control module. After locating the box it went fast.
2017 Montana 3160RL Legacy (6th trailer)
2017 Ford F-350 Crew Cab 6.7L 4X4
Love the cold, dislike the heat (A/C is my friend)