<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">2-6 volt @ 105 amps each, connected in series = 105 amps. </div></BLOCKQUOTE>
Any decent "golf cart" 6V battery will be rated at 220 amp-hours, not 105 AH, so the 6V's are equal or better than two Size 27 12V's in parallel (2 x 105 = 210).
The advantage of the 6V's is that golf cart batteries are contructed with heavy duty plates and will hold up well under repeated discharging/recharging. You can get 12V's with similar construction from Trojan, but they are pricey. Your chances of getting a discount price on a 6V are much better.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL