I have the same question as Starcraft--what are your expectations and how quickly did they die? As the others have said, don't give up yet. Once they get used and cycled a few more times, your battery life will be better.
I am a fan of the two 6v option myself. I made the switch to two Trojan T105 Plus 6v batts for my last trailer and with the occasional generator use--while powering the coffee pot in the mornings and topping off in the evening for example--I never came close to running out of battery power even on extended boondocking trips. For my new fiver, I will be installing two U.S. Battery US 2200 XC2 6 volters rated at 232ah each. I expect this will be a very good solution and a very good bang for the buck at $250 plus some cables.
