I seriously considered adding 2 more batteries but from everything I've read all recommendations were against adding new with old. So I bit the bullet and bought 4-Duracell Ultra 6V Deep Cycle Golf Cart Batteries 235AH from Batteries Plus. I ordered and paid for them on line picked them up at the local store with free shipping. They were $129 a piece but if you wait a few minutes before ordering you should receive a 10% offer.
If your dry camp much you will find the 4 battery bank to be "wonderful". I know I have never regretted it.
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