Sounds like your batteries aren't up to the task. I did a test and ran ours for 36 hours and still had 12.5 Volts, but just to be safe for our recent trip I add two additional batteries for a total of 4, so we should be able to go for a few days if we had too.
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Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top
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