Richard, here is a little more input. First I use 12 and 6 volt battery’s in a variety of applications. I also advocate the use of twin or quad 6 volt battery’s where ever possible. One thing you should be aware of when using two 6 volts is the problem you will encounter if for any reason one battery fails. Nothing in your RV will work on one 6 volt battery. When using 12 volts this will not become a problem. The quality of Life Line’s will greatly reduce this potential problem, but it will not eliminate it. Investing in quality battery’s is a big expense, make sure you understand all the pro’s and con’s of each application before you click on that mouse.