joe&julie81 wrote:
Is it still accepted that 2, 4, or 6, 6v battery are better than the same number of 12 v, even if series 31?
The most important thing about batteries for your trailer is that they are TRUE deep discharge batteries. Not car batteries or marine dual purpose.
The easiest/cheapest way to get deep discharge batteries is buy golf cart batteries. Very reasonably priced at Costco or Sams Club.
A quick and reasonably accurate way of comparing 6V vs 12V batteries
(assuming they are deep discharge) is by total weight. The more weight the better.
BTW, the proper terminology is "Group 31" not "series 31".