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 - Tractor Profile: Ferguson TO-20 - by Staff. When the infamous "Handshake Agreement" between Henry Ford and Harry Ferguson fell by the wayside (that's a story in itself), Harry Ferguson quickly set up manufacturing plants for a United States version of his English TE-20. The TO-20 was relatively the same as the TE-20 except utilized some different casting materials and had a US-style electrical system. The TO-20 was a dead ringer for the Ford 9N and 2N models and they say that Ferguson did this on purpose when the Handshake Agreement wen
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