A six volt battery is simply three battery cells hooked in series and stuck in a plastic box. A twelve volt battery is six battery cells hooked in series and stuck in a plastic box. So when all is equal, all IS equal.
The difference years back was that many 6 volt batteries had thicker plates and held up better in severe use; especially around vibration (like in tractors).
Now? There are plenty of HD 12 volt batteries around.
By the way, the Trojan T-105s are not really considered true HD deep-cycle batteries. Trojan L-16s are more HD. Rolls-Surrette even heavier.
I use a pair of Trojan T-105s in all my RVs simply because they are cost-efficient. Most I've had have lasted over 8 years and I've got a pair I'm using now that are approaching 10 years. Same with the equivalent from Deka that you can buy through NAPA.
Trojan T-105s were a great buy a few years back at $50 each. Now they're over $100.
As to your setup of two twelves in parallel being just as good as two sixes in series? Maybe. You'd have to define "good." To me, the cost over time is what makes that determination. You can buy 12 volt car batteries and get a long pro-rated warranty. You will NOT get much a warranty with HD, commercial, or deep cycle batteries. So, it's a toss up.
I've got a bank of 12 Deka deep-cycle six-volt batteries in my cabin that are now 8 years old. I've been contemplating what to replace them with when they go. When the time comes, it will depend on price and anticpated life - not whether they are 6 volt or 12 volt.
By the way, some of the longer lasting batteries on the market are sold as single 2 volt cells. They can last 20 years and are pricey.
One battery I'll never waste money on is an aborbed glass matt (AGM). I've yet to see where they are even close to being cost-efficient. But, you can run them upside down which might give some people a thrill.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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