You all bring up the points I was thinking about. With the 2 105 I am sure I could ditch the one twelve volt in the lance battery bay. Sounds like you all think that is the thing to do. Basically if you were looking from the rear of my camper on the left would be the original battery. In the middle the panel and converter charger on the right the existing fridge which is wired for dc operation from the factory. To the right rear in the generator compartment I will locate the two trojans in the old generator bay. So if they are connected together your saying either the trojans or the single twelve volt are going to discharge at a different rate. Which is not good. Now what happens when I am driving down the road and the batteries are charging. Isn't the same thing happening again between truck and camper batteries and if I had the trojans then I got a whole lot of different batteries charging. 2 in the truck 3 in the camper.
On a 1 to 10 scale 10 being the worst were would you guys rate just tying it all together.