Did you buy true deep cycle batteries? If there's CCA, CA or MCA (cranking amps) numbers listed on the top they are not suited for rv use, especially boondocking, but rather starting batteries for vehicles, boats & running trolling motors.
A deep cycle battery will only have aH (amp hours) listed on top.
Also curious about your "12 volt outlets"? You talking a cigarette lighter type plug or the standard household type plugs, which by the way are 120 volt & will only work with shore power or generator.
Danny & Linda
Sold our '13 Thor Redwood 36 FB
Currently RV & truckless