I'm kind of with Geof here on this. I think just a voltage meter would be best. Then you can check the voltage once in awhile and when they get low you start up the generator and top them up. I'm planning on putting in a voltage meter on mine with a momentary contact push button so I can just push the button for a reading. Then it won't draw any power when that button is not pushed. Very simple.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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