I completely concur with Sleepy regarding 12 volt vs. 6 volt. With 3 type 29 AGM 12 volt batteries we have NEVER had a dead battery situation in 9 years of extensive usage. We use 120 watts of solar, a Onan Generator that is most convenient, I believe the noise factor is over blown, although the Honda and Yamaha gens are very servicable, at our ages, just pushing a button is better. By exercising the Onan monthly for an hour, under load, it is dependable.
There is much solving of non-existant problems sometimes. I have found no need for extra heavy, extra large 6 volt batteries. Experience is the best teacher, so they say!