Recently bought our first travel trailer, and it has been quite the education, including understanding the dual electrical system. One thing I am thinking about doing is adding a 2d battery. I have ...
Make sure the larger 6V will fit where you are installing them. Two rules of thought here. 6V do offer more run time, but if one goes bad then you've only got one 6V. Probably doesn't happen often enough to warrant concern. Just some food for thought.