I just ignore the 6V golf cart battery crowd's fanboy comments, too. 12 volt Group 24/27/29/31 batteries are the only ones that fit where batteries belong in our RV.
That being given and since I want to use true deep cycle batteries, I have to budget for the extra cost of either true deep cycle 12V wet cell batteries or true deep cycle 12V AGM dry batteries.
Trojan and a few other manufacturers offer true deep cycle 12V wet cell batteries, and several manufacturers offer true deep cycle 12V AGM dry batteries.
However no matter what type or what manufacturer of (new) true deep cycle 12V battery you buy - they will always cost more than the easily available and inexpensive common 6V golf cart type wet cell true deep cycle batteries or the common 12V marine non-true-deep-cycle batteries that are found everywhere.
It's as simple (or complicated) as the above ... unless you opt for the ultimate and can pickup used 6V or 12V true deep cycle AGM dry batteries that are both cheap and have plenty of years left.
I saved up our money and installed a couple of new Group 31 true deep cycle 12V AGM dry battteries that hopefully will give me at least 6-8 years of hassle-free service.
2005 E450 Itasca 24V Class C
