Several have added a 3rd AC, replacing the vent in the bunk house. Most I've seen have been wired independent of the main box, by adding an additional 30 amp twist lock Furrion / Marinco inlet, routing wires through cabinets and up through the ceiling to the vent location. Just an option. Any rig that big needs 3 in my opinion. We only had 2 on our 40' Silverback, and with a few mods to the ducting and AC's, it kind of kept up. Really needed a 3rd though.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.