Yes the 2 - 6 volt batteries have to be wired in series the - on one battery to the + on the other battery and the other - & + posts on the batteries to the Pod.  This will give you 12 volts and keep the battery amp hours the same for the system.  The way the 12 volt batteries were (or should have been) wired were in parallel giving you the same 12volt of each battery but doubling the amp hours of the batteries to the system amp hours.  The advantage of using 2 - 6 volt batteries is you can get golf cart batteries, which are much heaver (more lead in them) and therefore can give you more service of electricity.  They still should not be run down to or below 50% of fully charged level.

Hope this helps

Pro's are: longer, deeper aH. Ya, no matter what the 12v'ers say, a longevity, sustainable system off-grid is a 6v system.

Cons: Weight, weight, weight.. Did I mention weight??? 

The tongue frame on our rPods are not the greatest and this additional weight needs to be thought though. Seriously... what else you plan on the tongue? How are you packed and what is you tongue weight now?

I have a dual 6 system now and find I don't need as much as I have. 230ah is far beyond my needs.

I do suggest a Power audit and decide from there what you require before investing into any sort of upgrade. 

Just me, but I'm switching over to a 60ah lithium (lipo4). Very light weight and will give me 2.5 days of autonomy. Between my solar panel (130w) and my B to B charger, I really don't see running out of power. 

Think about how you camp, how you wish to camp and what do you really need to consume for power. Then decide upon direction.

The only mistake we really make... Is not going camping! 

Happy, safe travels! 

OD,

What did you purchase for the B 2 B charger?

Renogy 20amp.   http://www.amazon.com/Renogy-Battery-Batteries-Multi-stage-Charging/dp/B07Q5VYPCF - http://www.amazon.com/Renogy-Battery-Batteries-Multi-stage-Charging/dp/B07Q5VYPCF

Review here:  http://www.youtube.com/watch?v=EcVjPap9dkY - http://www.youtube.com/watch?v=EcVjPap9dkY

I'm not sure which group, but other members speak well of it. I've yet to wire it (still very cold out there..).

New (to us) RPOD and it turns out that our battery (I assume original) needs to be replaced.  I've been looking at a 6v option but I'm concerned about the tongue weight given our TV is close to being maxed out.  Curious what adding the dual 6v did to yours?  Thinking about maybe locating them rear of the axle to mitigate (perhaps the storage compartment in back).  

I had the 6V option. Two 6V batteries weigh about 120 lbs. I now have a single LiFePO4 battery that weighs about 30 lbs. By changing, I was able to relocate the battery to an inside compartment since the Li batteries don't produce combustible hydrogen gas. That is the reason you can't relocate the lead-acid batteries to an inside compartment. You would be creating an explosion hazard.

Also, if something happened to where the charger started doing the bulk charge mode and the electrolyte was low or the battery/batteries had a bad cell, the excess current could heat the battery to the point of boiling. Then you get hydrochloric acid fumes which are very bad to breathe. I've experienced that when I was in a tracked vehicle wile I was in the Army. We could not stay in the vehicle. I don't recall if it was a bad voltage regulator or bad batteries, but it was really bad.

If you could make an isolated compartment with ventilation, then it might be possible.Still, you are better off having them on the tongue. Behind the axle can cause stability issues if you take too much weight off the tongue.

Originally posted by offgrid That sounds like it weighs almost about as much as my diesel tractor battery. A real back strainer getting that 95lb thing up into it's tray.

Funny or not so funny thing is that the battery was almost $ 200 with tax and had no handles to pick it up but had 4 plastic tabs with slots strategically positioned.   So . . . got some 1/2" clothesline rope and tied 2 ropes in a criss cross position.  At least it can be picked up now, with some effort.