mr_andyj wrote:
No reason to even consider NOT using two 6's.
Use two 6's!......
I have some reasons. First, I have read a lot of opinions, guesses and statements, but no facts or testing results to back them up.
Second, I have limited space and so do many other smaller RVs. I was able to remove the sliding tray and just fit 2 Lifeline AGM 12 volt batteries @ 150 AH each. My compartment gives me 1/2" clearance in height, 1/4" clearance in depth and about an 1 inch clearance in width. There are no other batteries and certainly no 6 volt batteries that would fit and have anywhere near the capacity.
6 volt batteries are often substantially larger for the amount of capacity provided.