We still have a two battery system in our Trilogy, but I've been reading up on the best way to wire batteries for the longest life recently and discovered that ours had been wired wrong for a two battery system.
Batteries must be wired differently depending on how many batteries make up your battery bank. For a two battery system you take the positive off of one battery and the ground off the other battery and those go to your camper. Then you cross connect the two batteries in parallel.
This distributes the "pull" of energy from the batteries evenly across the two batteries.
Ours had been wired where the two batteries were wired in parallel but the positive and ground came off of one battery and went to the camper.
I moved the camper positive to the other battery and checked the water levels.
I have attached a photo of how ours is now that I've properly wired the batteries to the camper.
2014 Dynamax Trilogy 37BH
2015 Ram 3500 DRW