2 12 volt batterys or 2 6 volt

korbe wrote:
My goal was to maximize amp hours with existing battery compartment storage area for 2 batteries. I went with 2 6-volt Trojan batteries. That setup gave me the best bang for my buck.

And certainly a viable solution in your case presuming you've already established that the characteristics of dual 6 volt deep cycle batteries suit your particular needs best. However, it's evident the OP is relying on others to tell him what's "best" without even telling us how he intends to use and maintain these batteries or even what space he has available to mount them. Your Trojans are a good example as the T-105 6 volt deep cycle battery is a great choice for those who regularly dry camp and expect deep discharge capability over many cycles, but the company also offers a great 12 volt SC series designed specifically for RV use where deep discharging isn't as frequent but the ability to handle heavy loads with minimal voltage drop under load (such as when powering an inverter) is more important. The devil is in the details so until the OP spells out the details for his particular situation no one can tell him what's "best".

FWIW, I'm in the latter group as we typically only dry camp either because campground power has failed for one reason or another OR there aren't any electric sites available. During those occasions I do expect to still power a few appliances in our camper using my 1000 watt inverter so the ability of the battery bank to sustain heavy but brief loads is far more important to me than the ability to sustain deep discharging over many cycles. For this reason, when it comes time to upgrade my own battery setup, I'll be installing a pair of G31 12 volt jugs which together will have a similar AH rating as a pair of 6 volt GG-2s. Certainly it would be easier to mount a pair of 6 volts on the tongue due to their dimensions but I do have the room for the G31s and in my case, for how I intend to use them, dual 12s are a better choice than dual 6s.