The simple answer to your question is; yes you can replace your 2 six volt deep cycle batteries with 2 twelve volt batteries. The question that you should be asking is; should you replace your 2 six volt deep cycle batteries with 2 12 volt batteries? The answer to that question is a resounding NO.
I know that it probably sounds logical that if you replace your 2 six volt deep cycle batteries with 2 twelve volt batteries that you will have twice as much power and that you will be able to use your 12 volt power 2 times longer before your batteries get low. But, sometimes things that seem logical may not always end up being correct.
Please read the answers to the questions below to find out why you should not do what you are planning to do.
If you want to really improve how long your house batteries last during boondocking etc. and you have the battery space in your RV you should consider having 2 more 6 volt batteries installed. By moving up to 4 six volt batteries you will double the length of time they will operate your 12 volt accessories before they need to be recharged.
I hope that this information was helpful to you.
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