For 3 or 4 days you might be better with 2 batteries. I've never heard that about the A/C other than the Comfort Control T-stat display runs off 12 volts, and I believe there is a switch on it to turn it off. If you have remote control for the slides or landing gear/stabilizers, the module for them draws power, as does the Propane Detector. Sounds like you haven't changed all the lites, so only use the ones with LEDs. Those standard lites draw and lot of juice. Good luck and enjoy
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2011 Chevy Silverado 3500HD Ext Cab LT DRW Duramax/Allison pulling a 2012 SOB (still Thor, but not a Keystone), Dual ACs, 4 Door Fridge, Fireplace, Sleep Number Bed, Level-Up Auto Levelers, Disc Brakes, Winegard DirecTV SlimLine Auto Dish, Onan 5.5K, Splendide Combo Washer/Dryer, GY G114s on HiSpec 17.5 wheels, TrailAir Tri-Glide Pin Box, Mor/ryde IS.
Michelle & Ann Sullivan and 4 American Shorthairs
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