Probably not so much anymore if you have all LED lighting, but with the original halogens, if you turned them all on at once that "D" sized OEM battery would turn it's self inside-out (ours came with a tiny no-name with no label and was almost lost in the battery box).
Plus remember the converter only puts that level out if it detects the need, such as leveling up and putting the slides out, that takes quite a draw from the Battery/Batteries and will bring them back up quickly.
During normal operation it's just putting out a trickle charge to keep the batteries topped off.
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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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