I am in the process of switching over to 2) 6V batteries vs 1 12V battery in my 5er. Picked up some interstate 6V batteries today but my new battery box wont be in for a few days. My question is "...
This was something I considered last year when upgrading my system, but I added solar panels also.
I went with 2 Group 31 AGM batteries and left them in the trailer all year. The snow would melt enough off of the solar panels to allow enough charging through the winter and the well below zero temps we had did not cause any issues since they were AGM's.