My four each 12VDC standard issue 85AH Interstates GP24s that came with the trailer was installed in 2008. I lost one right away because the trailer was using a ELIXIR ELX30A single mode converter/charger. This boiled out the fluids in one of my 12V Interstates which I didn't cath right away and resulted in a shorted cell. I upgraded the ELX30A Converter to a PD9260C Converter/charger unit and the remaining three 85AH batteries are just now going away on me. Hopefully I will get two groups of 6VDC Golf Cart batteries in series going this season giving my 440AHs Battery capacity.
I have been doing quite well using the three 85AHs Interstates since 2009 giving me 255AHs capacity. We normally camp off the power grid and have really give these batteries a big workout over the years...
Hoping my two groups of GC2 6VDC batteries will do the same for me...
Roy Ken