We have a box that does the generator switch, that also controls the legs to insure no more than 2 ACs start at the same time. At least that is what I am understanding.
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Best I recall, toy haulers with 3 A/C units, early on used a manual switch to control which 2 A/C units could be used at the same time. I don't think that approach was ever used on Landmark.
Later, when 3 A/C units were offered on Landmark 365, they came with Precision Circuits Systems (PCS) load management that automatically managed power consumption, shedding loads when necessary. That system has a display panel, along with several components within the main circuit breaker panel.
Best I recall, Landmark 365 units all also came with generator prep and should have a transfer switch behind the rear wall of the pass through basement storage. That transfer switch may also have some EMS protections built in. That transfer switch is intended to switch power between generator and shore power, automatically.
Btw, your profile still shows a 2011 Landmark, but perhaps you upgraded to a Landmark 365. If not, and if you added a 3rd A/C unit after purchase, it may be wired completely differently.