Originally Posted by ben322
I'm no expert but from what I've read is that with two 12v batteries, you can essentially lose one and still have house power…
Actually a misconception. If you lose one 12v house battery, you can use the other until it's depleted as well, but you can't
recharge— because the dead battery still in the system will fool the charger into never shutting off, and you'll cook the good battery until it dies too.
Either way, you've still got to perform some excavation to get to the battery box and replace the dead battery soonest, and it's still a trip ender— or at least a trip interrupter— regardless of which battery voltage you're using.
So you're not really all that much better off with two 12v batteries in parallel than you are with two 6v batteries.